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01/04/2021 – Ephemeris – A belated preview of January skies

January 4, 2021 Comments off

This is Ephemeris for Monday, January 4th. The Sun will rise at 8:20. It’ll be up for 8 hours and 56 minutes, setting at 5:16. The Moon, 2 days before last quarter, will rise at 11:29 this evening.

Let’s look ahead at the rest of January. Daylight hours will increase from 8 hours 56 minutes a day today to 9 hours 47 minutes on the 31st. The Sun’s noontime altitude above the southern horizon will increase from 22 ½ degrees today to 28 degrees on the 31st. The time of local noon, when the Sun is due south will be 12:52 pm on the 15th. The Straits area will have the Sun lower by a degree, and slightly shorter daytime hours. This month we’ll get into the heart of winter, and it’s going to be cold. This is moderated or intensified by the weather, which is always a wild card. In the night skies the winter stars, and Orion will make a bright display. Only Mars of all the naked-eye planets will be visible after twilight in the evening.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Note: The addendum of information about the month ahead has been added to my January 1st post here.

01/01/2021 – Ephemeris – The first few day of January have two annual astronomical events

January 1, 2021 1 comment

Note: With New Year’s Day followed by the weekend I’m postponing the January preview program to Monday the 4th, however, the Month Preview addendum will be added to the post today.

Happy New Year, this is Bob Moler with Ephemeris for New Year’s Day, Friday, January 1st 2021. The Sun will rise at 8:20. It’ll be up for 8 hours and 53 minutes, setting at 5:13. The Moon, 3 days past full, will rise at 7:51 this evening.

It happens that a lot of astronomical events occur in the first few days of January, that I’ll cover these now and talk about the rest of the month on Monday. Tomorrow, the second, at 3:59 am the Earth will be its closest to the Sun at 91.4 million miles (147.0 million kilometers). The only real effect is that it makes winter the shortest season, four days shorter than summer because the Earth moves fastest  when closest to the Sun. On Saturday evening the 2nd will see the peak of the Quadrantid meteor shower for a short time before the bright Moon rises at 9 p.m. the radiant point for this shower is low in the north, from an obsolete constellation of the Mural Quadrant located off the handle of the Big Dipper. The bright waning gibbous Moon will curtail the morning display of the shower when the radiant is higher. January 2nd also the latest sunrise. Later in January we will have brighter early mornings again.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

January Evening Star Chart

January Evening Star Chart

Star Chart for January 2021 (9 p.m. EST January 15, 2021). Click on image to enlarge. Created using my LookingUp program.

The planets and stars are plotted for the 15th at 9 p.m. EST in the evening and 6 a.m. for the morning chart. These are the chart times. The brilliant planet Venus will enter the sky at the chart time during the latter half of the month in the southwest.  Note that Traverse City is located approximately 45 minutes behind our time meridian, West 75° longitude. (An hour 45 minutes behind our daylight saving time meridian during EDT).

January Morning Star Chart

January Morning Star Chart January Morning Star Chart

Star Chart for January mornings 2021 (6 a.m. EST January 15, 2021). Click on image to enlarge. Created using my LookingUp program.

For a list of constellation names to go with the abbreviations click here.

  • Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
  • The leaky bowl of the Big Dipper drips on Leo.
  • Follow the arc of the handle of the Big Dipper to the star Arcturus, then
  • Follow the spike to Spica.
  • QuadR on the star charts is the radiant of the Quadrantid meteor shower which peaks on the 3rd, but is best seen in the early evening hours of the 2nd before the Moon rises.

Twilight Limits, Nautical and Astronomical

EST
Morning twilight Evening twilight Dark night Moon
Date Astro. Nautical Nautical Astro. Start End Illum.
2021-01-01 6h35m 7h10m 18h22m 18h57m 18h57m 19h51m 0.9
2021-01-02 6h35m 7h11m 18h23m 18h58m 18h58m 21h03m 0.83
2021-01-03 6h35m 7h11m 18h24m 18h59m 18h59m 22h16m 0.74
2021-01-04 6h35m 7h11m 18h24m 19h00m 19h00m 23h29m 0.64
2021-01-05 6h35m 7h11m 18h25m 19h01m 19h01m 0.52
2021-01-06 6h35m 7h10m 18h26m 19h02m 19h02m 0h42m 0.41
2021-01-07 6h35m 7h10m 18h27m 19h02m 19h02m 1h57m 0.3
2021-01-08 6h35m 7h10m 18h28m 19h03m 19h03m 3h13m 0.2
2021-01-09 6h35m 7h10m 18h29m 19h04m 19h04m 4h31m 0.11
2021-01-10 6h35m 7h10m 18h30m 19h05m 19h05m 5h48m 0.05
2021-01-11 6h35m 7h10m 18h31m 19h06m 19h06m 6h35m 0.01
2021-01-12 6h34m 7h09m 18h32m 19h07m 19h07m 6h34m 0
2021-01-13 6h34m 7h09m 18h33m 19h08m 19h08m 6h34m 0.01
2021-01-14 6h34m 7h09m 18h35m 19h09m 19h09m 6h34m 0.05
2021-01-15 6h33m 7h08m 18h36m 19h11m 20h17m 6h33m 0.1
2021-01-16 6h33m 7h08m 18h37m 19h12m 21h25m 6h33m 0.17
2021-01-17 6h32m 7h07m 18h38m 19h13m 22h31m 6h32m 0.26
2021-01-18 6h32m 7h07m 18h39m 19h14m 23h34m 6h32m 0.34
2021-01-19 6h31m 7h06m 18h40m 19h15m 6h31m 0.44
2021-01-20 6h31m 7h06m 18h41m 19h16m 0h36m 6h31m 0.53
2021-01-21 6h30m 7h05m 18h43m 19h17m 1h38m 6h30m 0.62
2021-01-22 6h30m 7h04m 18h44m 19h18m 2h40m 6h30m 0.71
2021-01-23 6h29m 7h04m 18h45m 19h20m 3h43m 6h29m 0.8
2021-01-24 6h28m 7h03m 18h46m 19h21m 4h47m 6h28m 0.87
2021-01-25 6h28m 7h02m 18h47m 19h22m 5h48m 6h28m 0.93
2021-01-26 6h27m 7h01m 18h49m 19h23m 0.97
2021-01-27 6h26m 7h01m 18h50m 19h24m 1
2021-01-28 6h25m 7h00m 18h51m 19h25m 1
2021-01-29 6h24m 6h59m 18h52m 19h27m 0.98
2021-01-30 6h24m 6h58m 18h54m 19h28m 19h28m 20h04m 0.93
2021-01-31 6h23m 6h57m 18h55m 19h29m 19h29m 21h18m 0.86

Twilight calendar was generated using Cartes du Ciel (Sky Charts).

See my blog post: Twilight Zone for the definitions of the different periods of twilight here: https://bobmoler.wordpress.com/2018/09/27/.

NASA Calendar of Planetary Events

Jan  1  Fr            Venus: 20.2° W
     1  Fr   2:05 am  Moon-Beehive: 2.5° S
     2  Sa   3:59 am  Perihelion: 0.9833 AU
     3  Su   9:47 am  Quadrantid Shower: ZHR = 120
     6  We   4:37 am  Last Quarter
     9  Sa  10:39 am  Moon Perigee: 367400 km
    10  Su   3:14 pm  Moon Descending Node
    11  Mo   3:11 pm  Moon-Venus: 1.5° N
    12  Tu   3:18 am  Moon South Dec.: 24.9° S
    13  We  12:00 am  New Moon
    20  We   4:02 pm  First Quarter
    21  Th   8:11 am  Moon Apogee: 404400 km
    23  Sa   8:59 pm  Mercury Elongation: 18.6° E
    23  Sa   9:26 pm  Saturn Conjunction with the Sun
    24  Su   4:47 pm  Moon Ascending Node
    26  Tu  10:39 am  Moon North Dec.: 24.9° N
    28  Th   9:50 am  Moon-Beehive: 2.4° S
    28  Th   2:16 pm  Full Moon
    28  Th   7:51 pm  Jupiter Conjunction with the Sun
Feb  1  Mo            Venus: 13° W

All event times are given for UTC-5 Eastern Standard Time.

Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC),
http://eclipse.gsfc.nasa.gov/SKYCAL/SKYCAL.html.

If you go to the above site you can print out a list like the above for the entire year or calendar pages for your time zone.

Sun and Moon Rising and Setting Events

LU                  Ephemeris of Sky Events for Interlochen/TC
January, 2021    Local time zone: EST
+-----------------------------------------------------------------------+
| DATE |  SUN     SUN  DAYLIGHT|   TWILIGHT*    |MOON  RISE OR    ILLUM |
|      |  RISE    SET    HOURS |  END    START  |PHASE SET** TIME FRACTN|
+=======================================================================+
|Fri  1| 08:20a  05:13p  08:53 | 06:23p  07:09a |      Rise 07:51p   91%|
|Sat  2| 08:20a  05:14p  08:54 | 06:24p  07:09a |      Rise 09:03p   84%|
+------+-----------------------+----------------+-----------------------+
|Sun  3| 08:20a  05:15p  08:55 | 06:25p  07:10a |      Rise 10:16p   76%|
|Mon  4| 08:20a  05:16p  08:56 | 06:26p  07:10a |      Rise 11:29p   66%|
|Tue  5| 08:19a  05:17p  08:57 | 06:27p  07:10a |      Rise 12:42a   55%|
|Wed  6| 08:19a  05:18p  08:58 | 06:28p  07:09a |L Qtr Rise 01:57a   43%|
|Thu  7| 08:19a  05:19p  08:59 | 06:29p  07:09a |      Rise 03:13a   32%|
|Fri  8| 08:19a  05:20p  09:01 | 06:30p  07:09a |      Rise 04:31a   22%|
|Sat  9| 08:19a  05:21p  09:02 | 06:31p  07:09a |      Rise 05:48a   13%|
+------+-----------------------+----------------+-----------------------+
|Sun 10| 08:18a  05:22p  09:04 | 06:32p  07:09a |      Rise 07:01a    6%|
|Mon 11| 08:18a  05:23p  09:05 | 06:33p  07:09a |      Rise 08:05a    2%|
|Tue 12| 08:17a  05:25p  09:07 | 06:34p  07:08a |      Rise 08:58a    0%|
|Wed 13| 08:17a  05:26p  09:08 | 06:35p  07:08a |New   Set  05:55p    1%|
|Thu 14| 08:16a  05:27p  09:10 | 06:36p  07:08a |      Set  07:06p    4%|
|Fri 15| 08:16a  05:28p  09:12 | 06:37p  07:07a |      Set  08:17p    9%|
|Sat 16| 08:15a  05:30p  09:14 | 06:38p  07:07a |      Set  09:25p   16%|
+------+-----------------------+----------------+-----------------------+
|Sun 17| 08:15a  05:31p  09:16 | 06:39p  07:06a |      Set  10:30p   24%|
|Mon 18| 08:14a  05:32p  09:18 | 06:40p  07:06a |      Set  11:34p   33%|
|Tue 19| 08:13a  05:33p  09:20 | 06:42p  07:05a |      Set  12:36a   42%|
|Wed 20| 08:13a  05:35p  09:22 | 06:43p  07:05a |F Qtr Set  01:38a   51%|
|Thu 21| 08:12a  05:36p  09:24 | 06:44p  07:04a |      Set  02:40a   60%|
|Fri 22| 08:11a  05:37p  09:26 | 06:45p  07:03a |      Set  03:43a   69%|
|Sat 23| 08:10a  05:39p  09:28 | 06:46p  07:03a |      Set  04:46a   78%|
+------+-----------------------+----------------+-----------------------+
|Sun 24| 08:09a  05:40p  09:30 | 06:48p  07:02a |      Set  05:48a   85%|
|Mon 25| 08:08a  05:42p  09:33 | 06:49p  07:01a |      Set  06:46a   92%|
|Tue 26| 08:07a  05:43p  09:35 | 06:50p  07:00a |      Set  07:38a   96%|
|Wed 27| 08:06a  05:44p  09:37 | 06:51p  07:00a |      Set  08:23a   99%|
|Thu 28| 08:05a  05:46p  09:40 | 06:52p  06:59a |Full  Rise 05:37p  100%|
|Fri 29| 08:04a  05:47p  09:42 | 06:54p  06:58a |      Rise 06:49p   98%|
|Sat 30| 08:03a  05:49p  09:45 | 06:55p  06:57a |      Rise 08:04p   94%|
+------+-----------------------+----------------+-----------------------+
|Sun 31| 08:02a  05:50p  09:47 | 06:56p  06:56a |      Rise 09:18p   88%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunrise and sunset

Generated using my LookingUp for DOS program.

11/02/2020 – Ephemeris – Previewing November Skies

November 2, 2020 Comments off

This is Ephemeris for Monday, November 2nd. Today the Sun will be up for 10 hours and 6 minutes, setting at 5:29, and it will rise tomorrow at 7:24. The Moon, 2 days past full, will rise at 6:47 this evening.

The month of November is one early sunsets, especially with the return to standard time yesterday, and shortening of day light hours. Daylight hours will decrease from 10 hours 9 minutes yesterday the 1st to 9 hours 4 minutes at month’s end. The altitude of the Sun above the southern horizon at local noon, which will drop from 31 degrees to 23½ degrees over the month. Apparent local noon this month will be around 12:30 pm. The sunset time on the 30th will be only 2 minutes later than the earliest sunset of the year. The sunrise time on the 30th will have 22 minutes to go to the latest sunrise. The Leonid meteor shower will have a peak on the morning of 17th with the Moon out of the way, but we are about 13 years away from the next Leonid meteor storm.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

November Evening Star Chart

November Evening Star Chart

Star Chart for November 2020 (9 p.m. EST November 15, 2019). Click on image to enlarge. Click on image to enlarge. Created using my LookingUp program.

The planets and stars are plotted for the 15th at 9 p.m. EST in the evening and 6 a.m. for the morning chart. These are the chart times. Note that Traverse City is located approximately 45 minutes behind our time meridian, West 75° longitude.

November Morning Star Chart

November 2020 Morning Star Chart

Star Chart for November mornings 2020 (6 a.m. EST November 15, 2020). Click on image to enlarge. Created using my LookingUp program.

For a list of constellation names to go with the abbreviations click here.

  • Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
  • Follow the arc of the handle of the Big Dipper to the star Arcturus
  • The Summer Triangle is in red.
  • TauR on the evening star chart can be used as the radiant for the North and South Taurid meteor showers.
  • LeoR on the morning star chart is the radiant of the Leonid meteor shower which peaks between the 16th to 21st.

Twilight Limits, Nautical and Astronomical

      EST        
  Morning twilight Evening twilight Dark night Moon
Date Astro. Nautical Nautical Astro. Start End Illum.
2020-11-01 5h47m 6h21m 18h39m 19h12m 1
2020-11-02 5h49m 6h23m 18h37m 19h11m 0.98
2020-11-03 5h50m 6h24m 18h36m 19h10m 19h10m 19h22m 0.94
2020-11-04 5h51m 6h25m 18h35m 19h09m 19h09m 20h04m 0.88
2020-11-05 5h52m 6h26m 18h34m 19h08m 19h08m 20h55m 0.81
2020-11-06 5h53m 6h27m 18h33m 19h07m 19h07m 21h54m 0.72
2020-11-07 5h54m 6h29m 18h32m 19h06m 19h06m 23h00m 0.62
2020-11-08 5h56m 6h30m 18h30m 19h05m 19h05m 0.51
2020-11-09 5h57m 6h31m 18h29m 19h04m 19h04m 0h12m 0.4
2020-11-10 5h58m 6h32m 18h28m 19h03m 19h03m 1h26m 0.29
2020-11-11 5h59m 6h33m 18h27m 19h02m 19h02m 2h42m 0.18
2020-11-12 6h00m 6h35m 18h27m 19h01m 19h01m 4h00m 0.1
2020-11-13 6h01m 6h36m 18h26m 19h00m 19h00m 5h19m 0.04
2020-11-14 6h03m 6h37m 18h25m 18h59m 18h59m 6h03m 0
2020-11-15 6h04m 6h38m 18h24m 18h58m 18h58m 6h04m 0
2020-11-16 6h05m 6h39m 18h23m 18h58m 18h58m 6h05m 0.04
2020-11-17 6h06m 6h41m 18h22m 18h57m 19h24m 6h06m 0.1
2020-11-18 6h07m 6h42m 18h22m 18h56m 20h24m 6h07m 0.18
2020-11-19 6h08m 6h43m 18h21m 18h56m 21h31m 6h08m 0.27
2020-11-20 6h09m 6h44m 18h20m 18h55m 22h39m 6h09m 0.38
2020-11-21 6h10m 6h45m 18h20m 18h54m 23h46m 6h10m 0.48
2020-11-22 6h12m 6h46m 18h19m 18h54m 6h12m 0.58
2020-11-23 6h13m 6h47m 18h19m 18h53m 0h52m 6h13m 0.68
2020-11-24 6h14m 6h48m 18h18m 18h53m 1h55m 6h14m 0.77
2020-11-25 6h15m 6h50m 18h18m 18h52m 2h57m 6h15m 0.84
2020-11-26 6h16m 6h51m 18h17m 18h52m 3h58m 6h16m 0.91
2020-11-27 6h17m 6h52m 18h17m 18h52m 5h00m 6h17m 0.96
2020-11-28 6h18m 6h53m 18h16m 18h51m 6h02m 6h18m 0.99
2020-11-29 6h19m 6h54m 18h16m 18h51m 0.99
2020-11-30 6h20m 6h55m 18h16m 18h51m 1

Twilight calendar was generated using Cartes du Ciel (Sky Charts).

See my blog post: Twilight Zone for the definitions of the different periods of twilight here: https://bobmoler.wordpress.com/2018/09/27/.

NASA Calendar of Planetary Events

   Date      Time    Event
Nov 1  Su            Venus: 34.2° W
    3  Tu  09:39 pm  Moon Ascending Node
    5  Th  12:50 am  South Taurid Meteor Shower: ZHR = 10
    5  Th  02:30 pm  Moon North Dec.: 24.8° N
    7  Sa  02:34 pm  Moon-Beehive: 2.4° S
    8  Su  08:46 am  Last Quarter
   10  Tu  11:59 am  Mercury Greatest Elongation: 19.1° W
   12  Th  12:06 am  North Taurid Meteor Shower: ZHR = 15
   12  Th  04:31 pm  Moon-Venus: 3° S
   14  Sa  06:48 am  Moon Perigee: 357,800 km
   15  Su  12:07 am  New Moon
   16  Mo  08:24 am  Venus-Spica: 3.8° N
   16  Mo  07:07 pm  Moon Descending Node
   17  Tu  06:24 am  Leonid Meteor Shower: ZHR = 15
   18  We  06:27 am  Moon South Dec.: 24.9° S
   19  Th  03:54 am  Moon-Jupiter: 2.6° N
   19  Th  09:57 am  Moon-Saturn: 3° N
   21  Sa  11:45 pm  First Quarter
   26  Th  07:29 pm  Moon Apogee: 405900 km
   30  Mo  04:30 am  Full Moon
   30  Mo  04:44 am  Penumbral Lunar Eclipse
                          (Asia, Aus., Pacific, Americas)
Dec 1  Tu            Venus: 27.5° W

All event times are given for UTC-5 Eastern Standard Time.

Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC),
http://eclipse.gsfc.nasa.gov/SKYCAL/SKYCAL.html.

If you go to the above site you can print out a list like the above for the entire year or calendar pages for your time zone.

Sun and Moon Rising and Setting Events

     LU                  Ephemeris of Sky Events for Interlochen/TC
November, 2020    Local time zone: EST
+-----------------------------------------------------------------------+
| DATE |  SUN     SUN  DAYLIGHT|   TWILIGHT*    |MOON  RISE OR    ILLUM |
|      |  RISE    SET    HOURS |  END    START  |PHASE SET** TIME FRACTN|
+=======================================================================+
|Sun  1| 07:21a  05:30p  10:09 | 06:35p  06:16a |      Rise 06:18p   98%|
|Mon  2| 07:22a  05:29p  10:06 | 06:34p  06:17a |      Rise 06:47p   95%|
|Tue  3| 07:24a  05:27p  10:03 | 06:33p  06:18a |      Rise 07:22p   90%|
|Wed  4| 07:25a  05:26p  10:01 | 06:32p  06:20a |      Rise 08:04p   83%|
|Thu  5| 07:26a  05:25p  09:58 | 06:30p  06:21a |      Rise 08:55p   75%|
|Fri  6| 07:28a  05:24p  09:55 | 06:29p  06:22a |      Rise 09:54p   66%|
|Sat  7| 07:29a  05:22p  09:53 | 06:28p  06:23a |      Rise 11:00p   56%|
+------+-----------------------+----------------+-----------------------+
|Sun  8| 07:31a  05:21p  09:50 | 06:27p  06:24a |L Qtr Rise 12:12a   45%|
|Mon  9| 07:32a  05:20p  09:48 | 06:26p  06:26a |      Rise 01:26a   35%|
|Tue 10| 07:33a  05:19p  09:45 | 06:25p  06:27a |      Rise 02:42a   24%|
|Wed 11| 07:35a  05:18p  09:43 | 06:24p  06:28a |      Rise 04:00a   15%|
|Thu 12| 07:36a  05:17p  09:40 | 06:23p  06:29a |      Rise 05:19a    7%|
|Fri 13| 07:37a  05:16p  09:38 | 06:22p  06:31a |      Rise 06:41a    2%|
|Sat 14| 07:39a  05:15p  09:35 | 06:22p  06:32a |      Rise 08:04a    0%|
+------+-----------------------+----------------+-----------------------+
|Sun 15| 07:40a  05:14p  09:33 | 06:21p  06:33a |New   Set  05:47p    1%|
|Mon 16| 07:41a  05:13p  09:31 | 06:20p  06:34a |      Set  06:31p    5%|
|Tue 17| 07:43a  05:12p  09:29 | 06:19p  06:35a |      Set  07:23p   11%|
|Wed 18| 07:44a  05:11p  09:26 | 06:18p  06:36a |      Set  08:24p   19%|
|Thu 19| 07:45a  05:10p  09:24 | 06:18p  06:38a |      Set  09:31p   28%|
|Fri 20| 07:47a  05:09p  09:22 | 06:17p  06:39a |      Set  10:39p   38%|
|Sat 21| 07:48a  05:08p  09:20 | 06:16p  06:40a |F Qtr Set  11:46p   48%|
+------+-----------------------+----------------+-----------------------+
|Sun 22| 07:49a  05:08p  09:18 | 06:16p  06:41a |      Set  12:52a   58%|
|Mon 23| 07:50a  05:07p  09:16 | 06:15p  06:42a |      Set  01:55a   67%|
|Tue 24| 07:52a  05:06p  09:14 | 06:15p  06:43a |      Set  02:57a   76%|
|Wed 25| 07:53a  05:06p  09:12 | 06:14p  06:44a |      Set  03:58a   83%|
|Thu 26| 07:54a  05:05p  09:11 | 06:14p  06:45a |      Set  04:59a   90%|
|Fri 27| 07:55a  05:05p  09:09 | 06:14p  06:46a |      Set  06:02a   95%|
|Sat 28| 07:57a  05:04p  09:07 | 06:13p  06:48a |      Set  07:05a   98%|
+------+-----------------------+----------------+-----------------------+
|Sun 29| 07:58a  05:04p  09:06 | 06:13p  06:49a |      Set  08:08a  100%|
|Mon 30| 07:59a  05:03p  09:04 | 06:13p  06:50a |Full  Rise 05:22p  100%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunrise and sunset

Generated using my LookingUp for DOS program.

10/01/2020 – Ephemeris – Previewing October Skies

October 1, 2020 Comments off

This is Ephemeris for Thursday, October 1st. Today the Sun will be up for 11 hours and 40 minutes, setting at 7:22, and it will rise tomorrow at 7:42. The Moon, at full today, the Harvest Moon, will rise at 7:45 this evening.

Let’s look at the skies for the month of October. The Sun will still be moving south rapidly. Daylight hours in the Interlochen/Traverse City area and will drop from 11 hours and 40 minutes today to 10 hours, 11 minutes at month’s end. The altitude of the Sun above the southern horizon at local noon will be 42 degrees today, and will descend to 31 degrees on Halloween, also in the Interlochen area. The Straits area will have the Sun a degree lower. Local noon, when the Sun is due south will be about 1:30 p.m. Sunrise times will increase from 7:41 today all the way to 8:20 a.m. in Interlochen and Traverse City on the 31st. Sunset times will decrease from 7:22 p.m. today to 6:32 on Halloween.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

October Evening Star Chart

October 2020 evening star chart

Star Chart for October 2020 (9 p.m. EDT October 15, 2020). Click on image to enlarge.Created using my LookingUp program. Click on image to enlarge.

The planets and stars are plotted for the 15th at 9 p.m. EDT in the evening and 6 a.m. for the morning chart. These are the chart times. Note that Traverse City is located approximately 45 minutes behind our time meridian, West 75° longitude. (An hour 45 minutes behind our daylight saving time meridian during EDT). To duplicate the star positions on a planisphere you may have to set it to 1 hour 45 minutes earlier than the current time.

October Morning Star Chart

October Morning Star Chart

Star Chart for October mornings 2020 (6 a.m. EDT October 15, 2020). Click on image to enlarge. Created using my LookingUp program.

For a list of constellation names to go with the abbreviations click here.

  • Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
  • Leaky dipper drips on Leo.
  • Follow the arc of the handle of the Big Dipper to the star Arcturus.
  • The Summer Triangle is in red.
  • DracR – Draconid Radiant – Peak 7/8th – Zenithal Hourly Rate = 10+
  • OriR – Orionid Radiant – Peak 22nd – Zenithal Hourly Rate = 20

Twilight Limits, Nautical and Astronomical

      EDT        
Traverse
City, MI
Morning twilight Evening twilight Dark night Moon
Date Astro. Nautical Nautical Astro. Start End Illum.
2020-10-01 6h09m 6h43m 20h28m 21h02m 1
2020-10-02 6h10m 6h45m 20h26m 21h01m 1
2020-10-03 6h12m 6h46m 20h25m 20h59m 0.98
2020-10-04 6h13m 6h47m 20h23m 20h57m 0.95
2020-10-05 6h14m 6h48m 20h21m 20h55m 20h55m 21h15m 0.9
2020-10-06 6h15m 6h49m 20h19m 20h53m 20h53m 21h46m 0.83
2020-10-07 6h17m 6h51m 20h17m 20h51m 20h51m 22h23m 0.75
2020-10-08 6h18m 6h52m 20h15m 20h49m 20h49m 23h09m 0.66
2020-10-09 6h19m 6h53m 20h14m 20h48m 20h48m 0.56
2020-10-10 6h21m 6h54m 20h12m 20h46m 20h46m 0h03m 0.45
2020-10-11 6h22m 6h56m 20h10m 20h44m 20h44m 1h06m 0.34
2020-10-12 6h23m 6h57m 20h09m 20h42m 20h42m 2h17m 0.24
2020-10-13 6h24m 6h58m 20h07m 20h41m 20h41m 3h32m 0.15
2020-10-14 6h25m 6h59m 20h05m 20h39m 20h39m 4h50m 0.07
2020-10-15 6h27m 7h00m 20h03m 20h37m 20h37m 6h10m 0.02
2020-10-16 6h28m 7h02m 20h02m 20h36m 20h36m 6h28m 0
2020-10-17 6h29m 7h03m 20h00m 20h34m 20h34m 6h29m 0.01
2020-10-18 6h30m 7h04m 19h59m 20h32m 20h32m 6h30m 0.06
2020-10-19 6h32m 7h05m 19h57m 20h31m 20h58m 6h32m 0.13
2020-10-20 6h33m 7h07m 19h55m 20h29m 21h45m 6h33m 0.22
2020-10-21 6h34m 7h08m 19h54m 20h28m 22h39m 6h34m 0.33
2020-10-22 6h35m 7h09m 19h52m 20h26m 23h41m 6h35m 0.44
2020-10-23 6h37m 7h10m 19h51m 20h25m 6h37m 0.55
2020-10-24 6h38m 7h12m 19h49m 20h23m 0h46m 6h38m 0.65
2020-10-25 6h39m 7h13m 19h48m 20h22m 1h52m 6h39m 0.75
2020-10-26 6h40m 7h14m 19h47m 20h20m 2h58m 6h40m 0.83
2020-10-27 6h41m 7h15m 19h45m 20h19m 4h01m 6h41m 0.89
2020-10-28 6h43m 7h16m 19h44m 20h18m 5h04m 6h43m 0.95
2020-10-29 6h44m 7h18m 19h42m 20h16m 6h05m 6h44m 0.95
2020-10-30 6h45m 7h19m 19h41m 20h15m 0.98
2020-10-31 6h46m 7h20m 19h40m 20h14m 1

Twilight calendar was generated using Cartes du Ciel (Sky Charts).

See my blog post: Twilight Zone for the definitions of the different periods of twilight here: https://bobmoler.wordpress.com/2018/09/27/.

NASA Calendar of Planetary Events

Oct 1  Th            Venus: 40.3° W
    1  Th  11:59 am  Mercury Greatest Elongation: 25.8° E
    1  Th  05:05 pm  Full Moon
    2  Fr  01:09 pm  Venus-Regulus: 0.1° S
    2  Fr  11:21 pm  Moon-Mars: 0.8° N
    3  Sa  01:22 pm  Moon Apogee: 406,300 km
    6  Tu  10:19 am  Mars nearest: 62,070,000 km
    6  Tu  09:25 pm  Draconid 1704 trail
    6  Tu  09:57 pm  Draconid 1711 trail
    7  We  08:29 pm  Moon Ascending Node
    8  Th  08:30 am  Draconid Meteor Shower: ZHR 10+
    9  Fr  09:07 am  Moon North Dec.: 24.6° N
    9  Fr  08:39 pm  Last Quarter
   11  Su  08:27 am  Moon-Beehive: 2.2° S
   13  Tu  07:10 pm  Mars Opposition
   13  Tu  07:57 pm  Moon-Venus: 4.4° S
   16  Fr  03:31 pm  New Moon
   16  Fr  07:46 pm  Moon Perigee: 356,900 km
   20  Tu  11:53 am  Moon Descending Node
   21  We  01:21 am  Orionid Meteor Shower: ZHR = 20
   21  We  10:00 pm  Moon South Dec.: 24.7° S
   22  Th  01:10 pm  Moon-Jupiter: 2.1° N
   22  Th  11:49 pm  Moon-Saturn: 2.7° N
   23  Fr  09:23 am  First Quarter
   25  Su  01:14 pm  Mercury Inferior Solar Conjunction
   29  Th  11:13 am  Moon-Mars: 3.3° N
   30  Fr  01:46 pm  Moon Apogee: 406,400 km
   31  Sa  09:49 am  Full Moon
   31  Sa  11:05 am  Uranus Opposition
Nov 1  Su            Venus: 34.2° W

All event times are given for UTC-4 hr: Eastern Daylight Saving Time.

Sky Events Calendar (with some tweaks) by Fred Espenak and Sumit Dutta (NASA’s GSFC),
http://eclipse.gsfc.nasa.gov/SKYCAL/SKYCAL.html.

If you go to the above site you can print out a list like the above for the entire year or calendar pages for your time zone.

Sun and Moon Rising and Setting Events

LU                  Ephemeris of Sky Events for Interlochen/TC
October, 2020    Local time zone: EDT
+-----------------------------------------------------------------------+
| DATE |  SUN     SUN  DAYLIGHT|   TWILIGHT*    |MOON  RISE OR    ILLUM |
|      |  RISE    SET    HOURS |  END    START  |PHASE SET** TIME FRACTN|
+=======================================================================+
|Thu  1| 07:41a  07:22p  11:40 | 08:25p  06:38a |Full  Rise 07:45p  100%|
|Fri  2| 07:42a  07:20p  11:37 | 08:23p  06:39a |      Rise 08:05p   99%|
|Sat  3| 07:43a  07:18p  11:34 | 08:21p  06:40a |      Rise 08:26p   96%|
+------+-----------------------+----------------+-----------------------+
|Sun  4| 07:45a  07:16p  11:31 | 08:19p  06:42a |      Rise 08:49p   91%|
|Mon  5| 07:46a  07:14p  11:28 | 08:17p  06:43a |      Rise 09:15p   85%|
|Tue  6| 07:47a  07:13p  11:25 | 08:16p  06:44a |      Rise 09:46p   78%|
|Wed  7| 07:48a  07:11p  11:22 | 08:14p  06:45a |      Rise 10:23p   70%|
|Thu  8| 07:50a  07:09p  11:19 | 08:12p  06:47a |      Rise 11:09p   60%|
|Fri  9| 07:51a  07:07p  11:16 | 08:10p  06:48a |L Qtr Rise 12:03a   50%|
|Sat 10| 07:52a  07:05p  11:13 | 08:08p  06:49a |      Rise 01:06a   40%|
+------+-----------------------+----------------+-----------------------+
|Sun 11| 07:53a  07:04p  11:10 | 08:07p  06:50a |      Rise 02:17a   30%|
|Mon 12| 07:55a  07:02p  11:07 | 08:05p  06:51a |      Rise 03:32a   20%|
|Tue 13| 07:56a  07:00p  11:04 | 08:03p  06:53a |      Rise 04:50a   12%|
|Wed 14| 07:57a  06:58p  11:01 | 08:02p  06:54a |      Rise 06:10a    5%|
|Thu 15| 07:58a  06:57p  10:58 | 08:00p  06:55a |      Rise 07:30a    1%|
|Fri 16| 08:00a  06:55p  10:55 | 07:58p  06:56a |New   Set  07:16p    0%|
|Sat 17| 08:01a  06:53p  10:52 | 07:57p  06:58a |      Set  07:45p    2%|
+------+-----------------------+----------------+-----------------------+
|Sun 18| 08:02a  06:52p  10:49 | 07:55p  06:59a |      Set  08:19p    7%|
|Mon 19| 08:04a  06:50p  10:46 | 07:54p  07:00a |      Set  08:58p   14%|
|Tue 20| 08:05a  06:48p  10:43 | 07:52p  07:01a |      Set  09:44p   24%|
|Wed 21| 08:06a  06:47p  10:40 | 07:50p  07:02a |      Set  10:39p   34%|
|Thu 22| 08:08a  06:45p  10:37 | 07:49p  07:04a |      Set  11:41p   44%|
|Fri 23| 08:09a  06:44p  10:34 | 07:47p  07:05a |F Qtr Set  12:46a   55%|
|Sat 24| 08:10a  06:42p  10:31 | 07:46p  07:06a |      Set  01:52a   65%|
+------+-----------------------+----------------+-----------------------+
|Sun 25| 08:12a  06:40p  10:28 | 07:45p  07:07a |      Set  02:57a   74%|
|Mon 26| 08:13a  06:39p  10:26 | 07:43p  07:09a |      Set  04:01a   82%|
|Tue 27| 08:14a  06:37p  10:23 | 07:42p  07:10a |      Set  05:04a   88%|
|Wed 28| 08:16a  06:36p  10:20 | 07:40p  07:11a |      Set  06:05a   94%|
|Thu 29| 08:17a  06:34p  10:17 | 07:39p  07:12a |      Set  07:06a   98%|
|Fri 30| 08:18a  06:33p  10:14 | 07:38p  07:13a |      Set  08:08a  100%|
|Sat 31| 08:20a  06:32p  10:11 | 07:36p  07:15a |Full  Rise 06:53p  100%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunrise and sunset

Generated using my LookingUp for DOS program.

09/01/2020 – Ephemeris – Previewing September skies

September 1, 2020 Comments off

This is Ephemeris for Tuesday, September 1st. Today the Sun will be up for 13 hours and 12 minutes, setting at 8:18, and it will rise tomorrow at 7:07. The Moon, 1 day before full, will set at 7:15 tomorrow morning.

Let’s look at the skies for September. Daylight hours in the Interlochen/Traverse City area and will drop from 13 hours and 12 minutes today to 11 hours 43 minutes on the 30th. The altitude of the sun above the southern horizon at local noon will be 53 degrees today, and will descend to 42 degrees on the 30th. The official season of summer is getting short too, so enjoy it while you can. Summer will end and autumn will begin at 9:31 a.m. on the 22nd as the Sun will pass overhead at the equator heading southward. It will also mark sunset at the north pole and sunrise at the south pole. Southern hemisphere dwellers will see the start of spring. The summer Milky way is still visible to explore with binoculars or telescope.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

September Star Chart

September 2020 Evening Star Chart

Star Chart for September 2020. Created using my LookingUp program. Click on the image to enlarge. Created using my LookingUp program.

The planets and stars are plotted for the 15th at 10 p.m. EDT in the evening and 6 a.m. for the morning chart. These are the chart times. Note that Traverse City is located approximately 45 minutes behind our time meridian, West 75° longitude. (An hour 45 minutes behind our daylight saving time meridian during EDT). To duplicate the star positions on a planisphere you may have to set it to 1 hour 45 minutes earlier than the current time.

September Morning Star Chart

September 2020 Morning Star Chart

Star Chart for September 2020 (10 p.m. EDT September 15, 2019). Click on image to enlarge.Created using my LookingUp program. Click on image to enlarge.

For a list of constellation names to go with the abbreviations click here.

  • Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
  • Leaky dipper drips on Leo.
  • Follow the arc of the handle of the Big Dipper to the star Arcturus.
  • The Summer Triangle is in red.

Twilight Limits, Nautical and Astronomical

      EDT        
  Morning twilight Evening twilight Dark night Moon
Date Astro. Nautical Nautical Astro. Start End Illum.
2020-09-01 5h26m 6h05m 21h28m 22h06m 0.99
2020-09-02 5h28m 6h06m 21h26m 22h04m 1
2020-09-03 5h30m 6h07m 21h24m 22h01m 0.99
2020-09-04 5h31m 6h09m 21h22m 21h59m 0.96
2020-09-05 5h33m 6h10m 21h20m 21h57m 21h57m 22h01m 0.91
2020-09-06 5h34m 6h11m 21h18m 21h55m 21h55m 22h22m 0.85
2020-09-07 5h36m 6h13m 21h16m 21h53m 21h53m 22h46m 0.77
2020-09-08 5h37m 6h14m 21h13m 21h50m 21h50m 23h14m 0.69
2020-09-09 5h39m 6h15m 21h11m 21h48m 21h48m 23h47m 0.59
2020-09-10 5h40m 6h17m 21h09m 21h46m 21h46m 0.49
2020-09-11 5h42m 6h18m 21h07m 21h44m 21h44m 0h28m 0.39
2020-09-12 5h43m 6h19m 21h05m 21h42m 21h42m 1h19m 0.29
2020-09-13 5h45m 6h21m 21h03m 21h39m 21h39m 2h19m 0.19
2020-09-14 5h46m 6h22m 21h01m 21h37m 21h37m 3h27m 0.11
2020-09-15 5h47m 6h23m 20h59m 21h35m 21h35m 4h42m 0.05
2020-09-16 5h49m 6h24m 20h57m 21h33m 21h33m 5h49m 0.01
2020-09-17 5h50m 6h26m 20h55m 21h31m 21h31m 5h50m 0
2020-09-18 5h52m 6h27m 20h53m 21h29m 21h29m 5h52m 0.03
2020-09-19 5h53m 6h28m 20h51m 21h27m 21h27m 5h53m 0.08
2020-09-20 5h54m 6h30m 20h49m 21h25m 21h50m 5h54m 0.16
2020-09-21 5h56m 6h31m 20h47m 21h23m 22h25m 5h56m 0.26
2020-09-22 5h57m 6h32m 20h46m 21h20m 23h05m 5h57m 0.38
2020-09-23 5h59m 6h33m 20h44m 21h18m 23h54m 5h59m 0.49
2020-09-24 6h00m 6h35m 20h42m 21h16m 6h00m 0.6
2020-09-25 6h01m 6h36m 20h40m 21h14m 0h49m 6h01m 0.71
2020-09-26 6h03m 6h37m 20h38m 21h12m 1h51m 6h03m 0.8
2020-09-27 6h04m 6h38m 20h36m 21h10m 2h55m 6h04m 0.87
2020-09-28 6h05m 6h40m 20h34m 21h08m 4h01m 6h05m 0.93
2020-09-29 6h06m 6h41m 20h32m 21h06m 5h06m 6h06m 0.93
2020-09-30 6h08m 6h42m 20h30m 21h04m 0.97

Twilight calendar was generated using Cartes du Ciel (Sky Charts).

See my blog post: Twilight Zone for the definitions of the different periods of twilight here: https://bobmoler.wordpress.com/2018/09/27/.

NASA Calendar of Planetary Events

      Date   Time    Event
Sep 1  Tu            Venus: 44.7° W
    2  We  01:22 am  Full Moon
    6  Su  12:42 am  Moon-Mars: 0°
    6  Su  02:31 am  Moon Apogee: 405,600 km
   10  Th  05:26 am  Last Quarter
   10  Th  07:05 pm  Moon Ascending Node
   11  Fr  03:15 pm  Neptune Opposition
   12  Sa  01:25 am  Moon North Dec.: 24.4° N
   12  Sa  08:10 pm  Venus-Beehive: 2.6° S
   13  Su  11:19 pm  Moon-Beehive: 1.9° S
   14  Mo  12:43 am  Moon-Venus: 4.6° S
   17  Th  07:00 am  New Moon
   18  Fr  09:44 am  Moon Perigee: 359,100 km
   22  Tu  02:06 am  Mercury-Spica: 0.3° N
   22  Tu  09:31 am  Autumnal Equinox
   23  We  08:33 am  Moon Descending Node
   23  We  09:55 pm  First Quarter
   24  Th  03:11 pm  Moon South Dec.: 24.5° S
   25  Fr  02:46 am  Moon-Jupiter: 1.7° N
   25  Fr  04:46 pm  Moon-Saturn: 2.5° N
Oct 1  Th            Venus: 40.3° W

All event times are given for UTC-4 hr: Eastern Daylight Saving Time.

Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC),
http://eclipse.gsfc.nasa.gov/SKYCAL/SKYCAL.html.

If you go to the above site you can print out a list like the above for the entire year or calendar pages for your time zone.

Sun and Moon Rising and Setting Events

     LU                  Ephemeris of Sky Events for Interlochen/TC
September, 2020    Local time zone: EDT
+-----------------------------------------------------------------------+
| DATE |  SUN     SUN  DAYLIGHT|   TWILIGHT*    |MOON  RISE OR    ILLUM |
|      |  RISE    SET    HOURS |  END    START  |PHASE SET** TIME FRACTN|
+=======================================================================+
|Tue  1| 07:05a  08:18p  13:12 | 09:24p  05:59a |      Set  07:15a  100%|
|Wed  2| 07:07a  08:16p  13:09 | 09:22p  06:00a |Full  Rise 08:58p   99%|
|Thu  3| 07:08a  08:14p  13:06 | 09:20p  06:02a |      Rise 09:20p   97%|
|Fri  4| 07:09a  08:13p  13:03 | 09:18p  06:03a |      Rise 09:40p   93%|
|Sat  5| 07:10a  08:11p  13:00 | 09:16p  06:04a |      Rise 10:00p   87%|
+------+-----------------------+----------------+-----------------------+
|Sun  6| 07:11a  08:09p  12:57 | 09:14p  06:06a |      Rise 10:22p   80%|
|Mon  7| 07:12a  08:07p  12:54 | 09:12p  06:07a |      Rise 10:46p   72%|
|Tue  8| 07:14a  08:05p  12:51 | 09:10p  06:09a |      Rise 11:14p   63%|
|Wed  9| 07:15a  08:03p  12:48 | 09:08p  06:10a |      Rise 11:48p   54%|
|Thu 10| 07:16a  08:01p  12:45 | 09:06p  06:11a |L Qtr Rise 12:29a   44%|
|Fri 11| 07:17a  07:59p  12:42 | 09:04p  06:12a |      Rise 01:19a   34%|
|Sat 12| 07:18a  07:58p  12:39 | 09:02p  06:14a |      Rise 02:19a   25%|
+------+-----------------------+----------------+-----------------------+
|Sun 13| 07:19a  07:56p  12:36 | 09:00p  06:15a |      Rise 03:27a   16%|
|Mon 14| 07:21a  07:54p  12:33 | 08:58p  06:16a |      Rise 04:42a    9%|
|Tue 15| 07:22a  07:52p  12:30 | 08:56p  06:18a |      Rise 06:01a    3%|
|Wed 16| 07:23a  07:50p  12:27 | 08:54p  06:19a |      Rise 07:20a    1%|
|Thu 17| 07:24a  07:48p  12:24 | 08:52p  06:20a |New   Set  08:25p    1%|
|Fri 18| 07:25a  07:46p  12:20 | 08:50p  06:22a |      Set  08:52p    4%|
|Sat 19| 07:27a  07:44p  12:17 | 08:48p  06:23a |      Set  09:19p   10%|
+------+-----------------------+----------------+-----------------------+
|Sun 20| 07:28a  07:42p  12:14 | 08:46p  06:24a |      Set  09:50p   18%|
|Mon 21| 07:29a  07:41p  12:11 | 08:44p  06:25a |      Set  10:24p   27%|
|Tue 22| 07:30a  07:39p  12:08 | 08:42p  06:27a |      Set  11:05p   38%|
|Wed 23| 07:31a  07:37p  12:05 | 08:40p  06:28a |F Qtr Set  11:53p   49%|
|Thu 24| 07:32a  07:35p  12:02 | 08:38p  06:29a |      Set  12:49a   60%|
|Fri 25| 07:34a  07:33p  11:59 | 08:36p  06:30a |      Set  01:51a   70%|
|Sat 26| 07:35a  07:31p  11:56 | 08:34p  06:32a |      Set  02:55a   79%|
+------+-----------------------+----------------+-----------------------+
|Sun 27| 07:36a  07:29p  11:53 | 08:32p  06:33a |      Set  04:01a   86%|
|Mon 28| 07:37a  07:27p  11:50 | 08:30p  06:34a |      Set  05:06a   92%|
|Tue 29| 07:38a  07:26p  11:47 | 08:28p  06:35a |      Set  06:09a   97%|
|Wed 30| 07:40a  07:24p  11:43 | 08:27p  06:37a |      Set  07:11a   99%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunrise and sunset

Generated using my LookingUp for DOS program.

07/31/2020 – Ephemeris – Previewing August skies

July 31, 2020 Comments off

This is Bob Moler with Ephemeris for Friday, July 31st. Today the Sun will be up for 14 hours and 40 minutes, setting at 9:09, and it will rise tomorrow at 6:29. The Moon, 3 days before full, will set at 4:04 tomorrow morning.

Let’s look ahead at the month of August in the skies. Daylight hours will decrease from 14 hours and 38 minutes tomorrow to 13 hours 15 minutes on the 31st. The altitude of the Sun at local noon, that is degrees of angle above the horizon will decrease from 63 degrees tomorrow to just over 53 degrees on the 31st. Straits area listeners can subtract one more degree from those angles. Local noon, when the Sun is due south, is about 1:43 p.m. The big event of the month will be in the late evening sky: The Perseid meteor shower will be best seen on the evening of the 11th before the Moon rises at 12:46 am. August is the first of my two favorite months for viewing the wonders of the summer Milky Way.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

August Evening Star Chart

August 2020 Evening Star Chart_2200-081520

Star Chart for August 2020 (10 p.m. EDT August 15, 2020). Click on image to enlarge. Created using my LookingUp program.

The planets and stars are plotted for the 15th at 10 p.m. EDT in the evening and 5 a.m. for the morning chart. These are the chart times. Note that Traverse City is located approximately 45 minutes behind our time meridian, West 75° longitude. (An hour 45 minutes behind our daylight saving time meridian during EDT). To duplicate the star positions on a planisphere you may have to set it to 1 hour 45 minutes earlier than the current time.

Note the chart times are for the 15th. For each week before the 15th add ½ hour (28 minutes if you’re picky). For each week after the 15th subtract ½ hour. The planet positions are updated each Wednesday on this blog. For planet positions on dates other than the 15th.

August Morning Star Chart

August Morning Star Chart

Star Chart for August mornings 2020 (5 a.m. EDT August 15, 2020). Click on image to enlarge. Created using my LookingUp program.

For a list of constellation names to go with the abbreviations click here.

  • Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
  • Leaky dipper drips on Leo.
  • Follow the arc of the handle of the Big Dipper to the star Arcturus, and
  • Extend like a spike to Spica.
  • The Summer Triangle is in red.
  • PerR is the radiant of the Perseid meteor shower (Peaks on the 12th)

Twilight Limits, Nautical and Astronomical

      EDT        
  Morning twilight Evening twilight Dark night Moon
Date Astro. Nautical Nautical Astro. Start End Illum.
2020-08-01 4h31m 5h19m 22h26m 23h14m 4h04m 4h31m 0.93
2020-08-02 4h33m 5h21m 22h24m 23h12m 0.98
2020-08-03 4h35m 5h22m 22h23m 23h10m 1
2020-08-04 4h37m 5h24m 22h21m 23h08m 1
2020-08-05 4h39m 5h25m 22h19m 23h06m 0.97
2020-08-06 4h41m 5h27m 22h18m 23h04m 0.93
2020-08-07 4h43m 5h28m 22h16m 23h01m 23h01m 23h16m 0.87
2020-08-08 4h44m 5h30m 22h14m 22h59m 22h59m 23h36m 0.8
2020-08-09 4h46m 5h31m 22h12m 22h57m 22h57m 23h57m 0.71
2020-08-10 4h48m 5h33m 22h10m 22h55m 22h55m 0.62
2020-08-11 4h50m 5h34m 22h09m 22h53m 22h53m 0h20m 0.52
2020-08-12 4h52m 5h36m 22h07m 22h51m 22h51m 0h46m 0.42
2020-08-13 4h54m 5h37m 22h05m 22h48m 22h48m 1h16m 0.33
2020-08-14 4h56m 5h39m 22h03m 22h46m 22h46m 1h53m 0.23
2020-08-15 4h57m 5h40m 22h01m 22h44m 22h44m 2h39m 0.15
2020-08-16 4h59m 5h42m 21h59m 22h42m 22h42m 3h35m 0.08
2020-08-17 5h01m 5h43m 21h57m 22h39m 22h39m 4h40m 0.03
2020-08-18 5h03m 5h45m 21h55m 22h37m 22h37m 5h03m 0
2020-08-19 5h05m 5h46m 21h53m 22h35m 22h35m 5h05m 0.01
2020-08-20 5h06m 5h48m 21h52m 22h33m 22h33m 5h06m 0.04
2020-08-21 5h08m 5h49m 21h50m 22h30m 22h30m 5h08m 0.1
2020-08-22 5h10m 5h50m 21h48m 22h28m 22h53m 5h10m 0.19
2020-08-23 5h12m 5h52m 21h46m 22h26m 23h20m 5h12m 0.29
2020-08-24 5h13m 5h53m 21h44m 22h24m 23h51m 5h13m 0.41
2020-08-25 5h15m 5h55m 21h42m 22h22m 5h15m 0.53
2020-08-26 5h17m 5h56m 21h40m 22h19m 0h27m 5h17m 0.64
2020-08-27 5h18m 5h58m 21h38m 22h17m 1h09m 5h18m 0.75
2020-08-28 5h20m 5h59m 21h36m 22h15m 1h59m 5h20m 0.83
2020-08-29 5h22m 6h00m 21h34m 22h13m 2h56m 5h22m 0.91
2020-08-30 5h23m 6h02m 21h32m 22h10m 3h58m 5h23m 0.91
2020-08-31 5h25m 6h03m 21h30m 22h08m 5h04m 5h25m 0.96

Twilight calendar was generated using Cartes du Ciel (Sky Charts).

See my blog post: Twilight Zone for the definitions of the different periods of twilight here: https://bobmoler.wordpress.com/2018/09/27/.

NASA Calendar of Planetary Events

    Date     Time    Event
Aug 1  Sa            Venus: 45.2° W
    1  Sa  04:47 am  Moon South Dec.: 24.1° S
    1  Sa  04:14 pm  Mercury-Pollux: 6.7° S
    1  Sa  07:30 pm  Moon-Jupiter: 1.6° N
    2  Su  09:17 am  Moon-Saturn: 2.4° N
    3  Mo  11:59 am  Full Moon
    9  Su  03:57 am  Moon-Mars: 0.8° N
    9  Su  09:51 am  Moon Apogee: 404700 km
   11  Tu  12:45 pm  Last Quarter
   12  We  09:02 am  Perseid Meteor Shower: ZHR = 90
   12  We  08:59 pm  Venus Greatest Elongation: 45.8° W
   14  Fr  03:22 pm  Moon Ascending Node
   15  Sa  09:01 am  Moon-Venus: 4.2° S
   15  Sa  04:40 pm  Moon North Dec.: 24.2° N
   17  Mo  10:47 am  Mercury Superior Solar Conjunction
   18  Tu  10:41 pm  New Moon
   21  Fr  06:59 am  Moon Perigee: 363500 km
   25  Tu  01:58 pm  First Quarter
   27  Th  07:52 am  Moon Descending Node
   28  Fr  10:06 am  Moon South Dec.: 24.2° S
   28  Fr  09:33 pm  Moon-Jupiter: 1.5° N
   29  Sa  12:40 pm  Moon-Saturn: 2.3° N
Sep 1  Tu            Venus: 44.7° W
All event times are given for UTC-4 hr: Eastern Daylight Saving Time.

Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC),
http://eclipse.gsfc.nasa.gov/SKYCAL/SKYCAL.html.

If you go to the above site you can print out a list like the above for the entire year or calendar pages for your time zone.

Sun and Moon Rising and Setting Events

LU              Ephemeris of Sky Events for Interlochen/TC
August, 2020    Local time zone: EDT
+-----------------------------------------------------------------------+
| DATE |  SUN     SUN  DAYLIGHT|   TWILIGHT*    |MOON  RISE OR    ILLUM |
|      |  RISE    SET    HOURS |  END    START  |PHASE SET** TIME FRACTN|
+=======================================================================+
|Sat  1| 06:29a  09:07p  14:38 | 10:23p  05:14a |      Set  05:04a   97%|
+------+-----------------------+----------------+-----------------------+
|Sun  2| 06:30a  09:06p  14:35 | 10:21p  05:15a |      Set  06:09a   99%|
|Mon  3| 06:31a  09:05p  14:33 | 10:19p  05:17a |Full  Rise 09:35p  100%|
|Tue  4| 06:33a  09:03p  14:30 | 10:17p  05:18a |      Rise 10:06p   98%|
|Wed  5| 06:34a  09:02p  14:28 | 10:16p  05:20a |      Rise 10:32p   94%|
|Thu  6| 06:35a  09:01p  14:25 | 10:14p  05:21a |      Rise 10:55p   89%|
|Fri  7| 06:36a  08:59p  14:23 | 10:12p  05:23a |      Rise 11:16p   82%|
|Sat  8| 06:37a  08:58p  14:20 | 10:10p  05:24a |      Rise 11:36p   75%|
+------+-----------------------+----------------+-----------------------+
|Sun  9| 06:38a  08:56p  14:18 | 10:09p  05:26a |      Rise 11:57p   66%|
|Mon 10| 06:39a  08:55p  14:15 | 10:07p  05:27a |      Rise 12:20a   57%|
|Tue 11| 06:41a  08:53p  14:12 | 10:05p  05:29a |L Qtr Rise 12:46a   47%|
|Wed 12| 06:42a  08:52p  14:10 | 10:03p  05:30a |      Rise 01:16a   38%|
|Thu 13| 06:43a  08:50p  14:07 | 10:01p  05:32a |      Rise 01:53a   28%|
|Fri 14| 06:44a  08:49p  14:04 | 09:59p  05:33a |      Rise 02:39a   20%|
|Sat 15| 06:45a  08:47p  14:01 | 09:58p  05:35a |      Rise 03:35a   12%|
+------+-----------------------+----------------+-----------------------+
|Sun 16| 06:46a  08:46p  13:59 | 09:56p  05:36a |      Rise 04:40a    6%|
|Mon 17| 06:48a  08:44p  13:56 | 09:54p  05:38a |      Rise 05:53a    2%|
|Tue 18| 06:49a  08:42p  13:53 | 09:52p  05:39a |New   Set  08:58p    0%|
|Wed 19| 06:50a  08:41p  13:50 | 09:50p  05:40a |      Set  09:30p    1%|
|Thu 20| 06:51a  08:39p  13:47 | 09:48p  05:42a |      Set  09:59p    5%|
|Fri 21| 06:52a  08:37p  13:44 | 09:46p  05:43a |      Set  10:26p   12%|
|Sat 22| 06:54a  08:36p  13:42 | 09:44p  05:45a |      Set  10:52p   20%|
+------+-----------------------+----------------+-----------------------+
|Sun 23| 06:55a  08:34p  13:39 | 09:42p  05:46a |      Set  11:20p   30%|
|Mon 24| 06:56a  08:32p  13:36 | 09:40p  05:48a |      Set  11:51p   42%|
|Tue 25| 06:57a  08:30p  13:33 | 09:38p  05:49a |F Qtr Set  12:26a   53%|
|Wed 26| 06:58a  08:29p  13:30 | 09:36p  05:51a |      Set  01:09a   64%|
|Thu 27| 06:59a  08:27p  13:27 | 09:34p  05:52a |      Set  01:58a   74%|
|Fri 28| 07:01a  08:25p  13:24 | 09:32p  05:53a |      Set  02:56a   83%|
|Sat 29| 07:02a  08:23p  13:21 | 09:30p  05:55a |      Set  03:58a   90%|
+------+-----------------------+----------------+-----------------------+
|Sun 30| 07:03a  08:22p  13:18 | 09:28p  05:56a |      Set  05:04a   95%|
|Mon 31| 07:04a  08:20p  13:15 | 09:26p  05:58a |      Set  06:10a   98%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunrise and sunset

Generated using my LookingUp for DOS program.

06/30/2020 – Ephemeris – Previewing the skies of July 2020

June 30, 2020 Comments off

This is Ephemeris for Tuesday, June 30th. Today the Sun will be up for 15 hours and 31 minutes, setting at 9:32, and it will rise tomorrow at 6:01. The Moon, 2 days past first quarter, will set at 3:15 tomorrow morning.

Lets preview July’s skies. The Sun, having reached its northern solstice, is beginning to slide southward again, at first imperceptibly, then with greater speed. The daylight hours will decrease from 15 hours and 30 minutes tomorrow to 14 hours 40 minutes at month’s end. The daylight hours will be slightly shorter south of Interlochen, and slightly longer to the north. The altitude of the Sun at local noon, when it is due south will decrease from 68 degrees tomorrow to 63 degrees at month’s end. Despite the warmth, the Earth will reach its greatest distance from the Sun on Saturday the 4th. Both Jupiter and Saturn reach opposition from the Sun this month and officially become evening planets.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

July Evening Star Chart

July Evening Star Chart

Star Chart for July 2020 (11 p.m. EDT July 15, 2019). Created using my LookingUp program. Click on image to enlarge.

The planets and stars are plotted for the 15th at 11 p.m. EDT in the evening and 4:30 a.m. for the morning chart. These are the chart times. Note that Traverse City is located approximately 45 minutes behind our time meridian, West 75° longitude. (An hour 45 minutes behind our daylight saving time meridian during EDT). To duplicate the star positions on a planisphere you may have to set it to 1 hour 45 minutes earlier than the current time.

Note the chart times are for the 15th. For each week before the 15th add ½ hour (28 minutes if you’re picky). For each week after the 15th subtract ½ hour. The planet positions are updated each Wednesday on this blog. For planet positions on dates other than the 15th.

July Morning Star Chart

July Morning Star Chart

Star Chart for July mornings 2020 (4:30 a.m. EDT July 15, 2019). Created using my LookingUp program. Click on image to enlarge.

For a list of constellation names to go with the abbreviations click here.

  • Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
  • Leaky dipper drips on Leo.
  • Follow the arc of the handle of the Big Dipper to the star Arcturus, and
  • Extend like a spike to Spica.
  • The Summer Triangle is in red.
  • DAqR is the radiant of the South Delta Aquariid meteor shower (Peaks on the 27th)

Twilight Limits, Nautical and Astronomical

      EDT        
  Morning twilight Evening twilight Dark night Moon
Date Astro. Nautical Nautical Astro. Start End Illum.
2020-07-01 3h38m 4h41m 23h00m 0h03m 3h15m 3h38m 0.88
2020-07-02 3h39m 4h42m 22h59m 0h02m 0.95
2020-07-03 3h40m 4h43m 22h59m 0h01m 0.95
2020-07-04 3h42m 4h43m 22h58m 0h00m 0.99
2020-07-05 3h43m 4h44m 22h58m 23h59m 1
2020-07-06 3h44m 4h45m 22h57m 23h58m 0.99
2020-07-07 3h46m 4h46m 22h56m 23h57m 0.95
2020-07-08 3h47m 4h47m 22h56m 23h56m 23h56m 0.89
2020-07-09 3h49m 4h48m 22h55m 23h54m 23h54m 0h05m 0.82
2020-07-10 3h50m 4h49m 22h54m 23h53m 23h53m 0h30m 0.74
2020-07-11 3h52m 4h51m 22h53m 23h52m 23h52m 0h52m 0.65
2020-07-12 3h54m 4h52m 22h52m 23h50m 23h50m 1h13m 0.55
2020-07-13 3h55m 4h53m 22h51m 23h49m 23h49m 1h33m 0.45
2020-07-14 3h57m 4h54m 22h50m 23h47m 23h47m 1h55m 0.36
2020-07-15 3h59m 4h55m 22h49m 23h46m 23h46m 2h19m 0.26
2020-07-16 4h01m 4h57m 22h48m 23h44m 23h44m 2h47m 0.18
2020-07-17 4h02m 4h58m 22h47m 23h43m 23h43m 3h20m 0.11
2020-07-18 4h04m 4h59m 22h46m 23h41m 23h41m 4h01m 0.05
2020-07-19 4h06m 5h01m 22h45m 23h39m 23h39m 4h06m 0.01
2020-07-20 4h08m 5h02m 22h44m 23h38m 23h38m 4h08m 0
2020-07-21 4h10m 5h03m 22h42m 23h36m 23h36m 4h10m 0.01
2020-07-22 4h12m 5h05m 22h41m 23h34m 23h34m 4h12m 0.06
2020-07-23 4h14m 5h06m 22h40m 23h32m 23h32m 4h14m 0.12
2020-07-24 4h16m 5h08m 22h38m 23h30m 23h58m 4h16m 0.21
2020-07-25 4h17m 5h09m 22h37m 23h28m 4h17m 0.32
2020-07-26 4h19m 5h10m 22h35m 23h26m 0h24m 4h19m 0.44
2020-07-27 4h21m 5h12m 22h34m 23h24m 0h50m 4h21m 0.56
2020-07-28 4h23m 5h13m 22h32m 23h22m 1h18m 4h23m 0.67
2020-07-29 4h25m 5h15m 22h31m 23h20m 1h49m 4h25m 0.77
2020-07-30 4h27m 5h16m 22h29m 23h18m 2h27m 4h27m 0.86
2020-07-31 4h29m 5h18m 22h28m 23h16m 3h11m 4h29m 0.93

Twilight calendar was generated using Cartes du Ciel (Sky Charts).

See my blog post: Twilight Zone for the definitions of the different periods of twilight here: https://bobmoler.wordpress.com/2018/09/27/.

NASA Calendar of Planetary Events

Date       Time      Event
Jul 1  We            Venus: 34.3° W
    3  Fr  11:18 pm  Moon Descending Node
    4  Sa  10:59 am  Aphelion: 1.0167 AU
    4  Sa  09:37 pm  Moon South Dec.: 24.1° S
    5  Su  12:30 am  Penumbral Lunar Eclipse
	                    (Americas, sw Europe, Africa)
    5  Su  12:44 am  Full Moon
    5  Su  05:37 pm  Moon-Jupiter: 1.9° N
    6  Mo  04:45 am  Moon-Saturn: 2.6° N
   11  Sa  08:17 am  Venus-Aldebaran: 1° N
   11  Sa  03:36 pm  Moon-Mars: 2.2° N
   12  Su  03:27 pm  Moon Apogee: 404200 km
   12  Su  07:29 pm  Last Quarter
   14  Tu  03:03 am  Jupiter Opposition
   17  Fr  03:26 am  Moon-Venus: 3.4° S
   18  Sa  08:33 am  Moon Ascending Node
   19  Su  07:51 am  Moon North Dec.: 24.1° N
   20  Mo  01:33 pm  New Moon
   20  Mo  05:33 pm  Saturn Opposition
   22  We  10:59 am  Mercury Greatest Elongation: 20.1° W
   25  Sa  12:54 am  Moon Perigee: 368400 km
   27  Mo  08:32 am  First Quarter
   27  Mo  05:08 pm  Delta Aquarid Meteor Shower: ZHR = 20
   31  Fr  05:32 am  Moon Descending Node
Aug 1  Sa            Venus: 45.2° W

All event times are given for UTC-4 hr: Eastern Daylight Saving Time.

Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC),
http://eclipse.gsfc.nasa.gov/SKYCAL/SKYCAL.html.

If you go to the above site you can print out a list like the above for the entire year or calendar pages for your time zone.

Sun and Moon Rising and Setting Events

     LU                  Ephemeris of Sky Events for Interlochen/TC
July, 2020    Local time zone: EDT
+-----------------------------------------------------------------------+
| DATE |  SUN     SUN  DAYLIGHT|   TWILIGHT*    |MOON  RISE OR    ILLUM |
|      |  RISE    SET    HOURS |  END    START  |PHASE SET** TIME FRACTN|
+=======================================================================+
|Wed  1| 06:01a  09:31p  15:30 | 10:57p  04:35a |      Set  03:49a   87%|
|Thu  2| 06:01a  09:31p  15:29 | 10:56p  04:36a |      Set  04:29a   94%|
|Fri  3| 06:02a  09:31p  15:28 | 10:56p  04:37a |      Set  05:18a   98%|
|Sat  4| 06:03a  09:31p  15:27 | 10:55p  04:38a |      Set  06:15a  100%|
+------+-----------------------+----------------+-----------------------+
|Sun  5| 06:03a  09:30p  15:26 | 10:55p  04:39a |Full  Rise 10:19p   99%|
|Mon  6| 06:04a  09:30p  15:25 | 10:54p  04:40a |      Rise 11:02p   96%|
|Tue  7| 06:05a  09:29p  15:24 | 10:53p  04:41a |      Rise 11:37p   91%|
|Wed  8| 06:06a  09:29p  15:23 | 10:53p  04:42a |      Rise 12:05a   85%|
|Thu  9| 06:06a  09:29p  15:22 | 10:52p  04:43a |      Rise 12:30a   77%|
|Fri 10| 06:07a  09:28p  15:20 | 10:51p  04:44a |      Rise 12:52a   68%|
|Sat 11| 06:08a  09:27p  15:19 | 10:50p  04:45a |      Rise 01:12a   59%|
+------+-----------------------+----------------+-----------------------+
|Sun 12| 06:09a  09:27p  15:17 | 10:49p  04:46a |L Qtr Rise 01:33a   50%|
|Mon 13| 06:10a  09:26p  15:16 | 10:48p  04:47a |      Rise 01:55a   40%|
|Tue 14| 06:11a  09:25p  15:14 | 10:47p  04:49a |      Rise 02:19a   31%|
|Wed 15| 06:11a  09:25p  15:13 | 10:46p  04:50a |      Rise 02:47a   23%|
|Thu 16| 06:12a  09:24p  15:11 | 10:45p  04:51a |      Rise 03:20a   15%|
|Fri 17| 06:13a  09:23p  15:09 | 10:44p  04:52a |      Rise 04:01a    8%|
|Sat 18| 06:14a  09:22p  15:08 | 10:43p  04:54a |      Rise 04:52a    4%|
+------+-----------------------+----------------+-----------------------+
|Sun 19| 06:15a  09:21p  15:06 | 10:41p  04:55a |      Rise 05:52a    1%|
|Mon 20| 06:16a  09:21p  15:04 | 10:40p  04:56a |New   Set  09:45p    0%|
|Tue 21| 06:17a  09:20p  15:02 | 10:39p  04:58a |      Set  10:26p    2%|
|Wed 22| 06:18a  09:19p  15:00 | 10:38p  04:59a |      Set  11:01p    7%|
|Thu 23| 06:19a  09:18p  14:58 | 10:36p  05:00a |      Set  11:31p   14%|
|Fri 24| 06:20a  09:17p  14:56 | 10:35p  05:02a |      Set  11:58p   22%|
|Sat 25| 06:21a  09:16p  14:54 | 10:33p  05:03a |      Set  12:24a   33%|
+------+-----------------------+----------------+-----------------------+
|Sun 26| 06:22a  09:15p  14:52 | 10:32p  05:05a |      Set  12:50a   44%|
|Mon 27| 06:24a  09:13p  14:49 | 10:30p  05:06a |F Qtr Set  01:18a   55%|
|Tue 28| 06:25a  09:12p  14:47 | 10:29p  05:08a |      Set  01:49a   67%|
|Wed 29| 06:26a  09:11p  14:45 | 10:27p  05:09a |      Set  02:27a   77%|
|Thu 30| 06:27a  09:10p  14:42 | 10:26p  05:11a |      Set  03:11a   85%|
|Fri 31| 06:28a  09:09p  14:40 | 10:24p  05:12a |      Set  04:04a   92%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunrise and sunset

								

06/01/2020 – Ephemeris – Let’s preview June’s bright skies (Long days and short nights)

June 1, 2020 Comments off

This is Bob Moler with Ephemeris for Monday, June 1st. Today the Sun will be up for 15 hours and 21 minutes, setting at 9:21, and it will rise tomorrow at 5:59. The Moon, 3 days past first quarter, will set at 4:15 tomorrow morning.

Ephemeris start’s its 46th orbit of the Sun today, so let’s preview June skies. There will be a lot of sunlight in June. The daylight hours will increase a bit from 15 hours and 21 minutes today to 15 hours and 34 minutes on the 20th, the solstice, retreating back to 15 hours 31 minutes at month’s end. At this time of the year the sunset times for Ludington, Interlochen, Petoskey and Mackinaw City are very nearly the same. However the sunrise times are at their most divergent. With Ludington’s sunrise being 14 minutes later than Mackinaw City’s. The altitude of the Sun above the southern horizon at local noon will increase from about 67 and a half degrees to 68 and three-quarters on the 20th. Local noon, when the Sun is actually due south in the Interlochen area will occur at about 1:43 p.m.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

June Evening Star Chart

June Evening Star Chart

Star Chart for June 2020 (11 p.m. EDT June 15, 2020). Created using my LookingUp program. Click on image to enlarge.

The planets and stars are plotted for the 15th at 11 p.m. EDT in the evening and 4 a.m. for the morning chart. These are the chart times. Note that Traverse City is located approximately 45 minutes behind our time meridian, West 75° longitude. (An hour 45 minutes behind our daylight saving time meridian during EDT). To duplicate the star positions on a planisphere you may have to set it to 1 hour 45 minutes earlier than the current time.

Note the chart times of 11 p.m. and 4 a.m. are for the 15th. For each week before the 15th add ½ hour (28 minutes if you’re picky). For each week after the 15th subtract ½ hour. The planet positions are updated each Wednesday on this blog. For planet positions on dates other than the 15th, check the Wednesday planet posts on this blog.

June Morning Star Chart

June Morning Star Chart

Star Chart for June mornings 2020 (4 a.m. EDT June 15, 2020). Created using my LookingUp program. Click on image to enlarge.

For a list of constellation names to go with the abbreviations click here.

  • Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
  • Leaky dipper drips on Leo.
  • Follow the arc of the handle of the Big Dipper to the star Arcturus, and
  • Extend like a spike to Spica.
  • The Summer Triangle is in red.

Twilight Limits, Nautical and Astronomical

      EDT        
  Morning twilight Evening twilight Dark night Moon
Date Astro. Nautical Nautical Astro. Start End Illum.
2020-06-01 3h42m 4h41m 22h47m 23h47m 0.82
2020-06-02 3h41m 4h41m 22h48m 23h48m 0.9
2020-06-03 3h40m 4h40m 22h49m 23h50m 0.9
2020-06-04 3h39m 4h39m 22h50m 23h51m 0.96
2020-06-05 3h37m 4h39m 22h51m 23h52m 1
2020-06-06 3h36m 4h38m 22h52m 23h54m 1
2020-06-07 3h36m 4h37m 22h53m 23h55m 0.97
2020-06-08 3h35m 4h37m 22h54m 23h56m 23h56m 0.92
2020-06-09 3h34m 4h37m 22h55m 23h58m 23h58m 0h28m 0.85
2020-06-10 3h33m 4h36m 22h56m 23h59m 23h59m 1h07m 0.77
2020-06-11 3h33m 4h36m 22h56m 0h00m 0h00m 1h38m 0.67
2020-06-12 3h32m 4h36m 22h57m 0h01m 0h01m 2h04m 0.58
2020-06-13 3h32m 4h35m 22h58m 0h01m 0h01m 2h27m 0.48
2020-06-14 3h31m 4h35m 22h58m 0h02m 0h02m 2h48m 0.38
2020-06-15 3h31m 4h35m 22h59m 0h03m 0h03m 3h09m 0.29
2020-06-16 3h31m 4h35m 22h59m 0h04m 0h04m 3h30m 0.21
2020-06-17 3h31m 4h35m 23h00m 0h04m 0h04m 3h31m 0.13
2020-06-18 3h31m 4h35m 23h00m 0h05m 0h05m 3h31m 0.07
2020-06-19 3h31m 4h35m 23h00m 0h05m 0h05m 3h31m 0.03
2020-06-20 3h31m 4h36m 23h01m 0h05m 0h05m 3h31m 0
2020-06-21 3h31m 4h36m 23h01m 0h05m 0h05m 3h31m 0
2020-06-22 3h31m 4h36m 23h01m 0h06m 0h06m 3h31m 0.03
2020-06-23 3h32m 4h36m 23h01m 0h06m 0h06m 3h32m 0.07
2020-06-24 3h32m 4h37m 23h01m 0h05m 0h05m 3h32m 0.15
2020-06-25 3h33m 4h37m 23h01m 0h05m 0h28m 3h33m 0.24
2020-06-26 3h34m 4h38m 23h01m 0h05m 1h00m 3h34m 0.34
2020-06-27 3h34m 4h38m 23h01m 0h05m 1h28m 3h34m 0.46
2020-06-28 3h35m 4h39m 23h01m 0h04m 1h54m 3h35m 0.58
2020-06-29 3h36m 4h40m 23h00m 0h04m 2h19m 3h36m 0.69
2020-06-30 3h37m 4h40m 23h00m 0h03m 2h46m 3h37m 0.69

Twilight calendar was generated using Cartes du Ciel (Sky Charts).

See my blog post: Twilight Zone for the definitions of the different periods of twilight here: https://bobmoler.wordpress.com/2018/09/27/.

NASA Calendar of Planetary Events

Date       Time    Event
Jun 1  Mo            Venus: 3.7° E
    2  Tu  11:36 pm  Moon Perigee: 364400 km
    3  We  01:42 pm  Venus Inferior Solar Conjunction
    4  Th  08:59 am  Mercury Greatest Elongation: 23.6° E
    5  Fr  03:12 pm  Full Moon
    5  Fr  03:25 pm  Penumbral Lunar Eclipse
	                 (Europe, Africa, Asia, Aus.)
    6  Sa  02:10 pm  Moon Descending Node
    7  Su  12:22 pm  Moon South Dec.: 24.1° S
    8  Mo  01:19 pm  Moon-Jupiter: 2.3° N
    8  Mo  10:19 pm  Moon-Saturn: 2.8° N
   12  Fr  07:53 pm  Moon-Mars: 3° N
   13  Sa  02:24 am  Last Quarter
   14  Su  08:56 pm  Moon Apogee: 404600 km
   19  Fr  04:52 am  Moon-Venus: 0.8° S
   20  Sa  05:43 pm  Summer Solstice
   21  Su  12:24 am  Moon Ascending Node
   21  Su  02:40 am  Annular Solar Eclipse
                         (Africa, Asia)
   21  Su  02:41 am  New Moon
   21  Su  11:56 pm  Moon North Dec.: 24.1° N
   23  Tu  08:33 pm  Moon-Beehive: 1.8° S
   28  Su  04:16 am  First Quarter
   29  Mo  10:09 pm  Moon Perigee: 369000 km
   30  Tu  10:45 pm  Mercury Inferior Solar Conjunction

All event times are given for UTC-4 hr: Eastern Daylight Saving Time.

Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC),
http://eclipse.gsfc.nasa.gov/SKYCAL/SKYCAL.html.

If you go to the above site you can print out a list like the above for the entire year or calendar pages for your time zone.

Sun and Moon Rising and Setting Events

                Ephemeris of Sky Events for Interlochen/TC
June, 2020    Local time zone: EDT
+-----------------------------------------------------------------------+
| DATE |  SUN     SUN  DAYLIGHT|   TWILIGHT*    |MOON  RISE OR    ILLUM |
|      |  RISE    SET    HOURS |  END    START  |PHASE SET** TIME FRACTN|
+=======================================================================+
|Mon  1| 06:00a  09:21p  15:21 | 10:45p  04:36a |      Set  04:15a   81%|
|Tue  2| 05:59a  09:22p  15:23 | 10:46p  04:36a |      Set  04:44a   89%|
|Wed  3| 05:59a  09:23p  15:24 | 10:47p  04:35a |      Set  05:15a   95%|
|Thu  4| 05:58a  09:24p  15:25 | 10:48p  04:34a |      Set  05:53a   99%|
|Fri  5| 05:58a  09:24p  15:26 | 10:49p  04:34a |Full  Rise 09:32p  100%|
|Sat  6| 05:57a  09:25p  15:27 | 10:50p  04:33a |      Rise 10:41p   98%|
+------+-----------------------+----------------+-----------------------+
|Sun  7| 05:57a  09:26p  15:28 | 10:51p  04:32a |      Rise 11:39p   94%|
|Mon  8| 05:57a  09:26p  15:29 | 10:52p  04:32a |      Rise 12:28a   88%|
|Tue  9| 05:57a  09:27p  15:30 | 10:52p  04:32a |      Rise 01:06a   80%|
|Wed 10| 05:56a  09:28p  15:31 | 10:53p  04:31a |      Rise 01:38a   71%|
|Thu 11| 05:56a  09:28p  15:31 | 10:54p  04:31a |      Rise 02:04a   62%|
|Fri 12| 05:56a  09:29p  15:32 | 10:54p  04:31a |      Rise 02:27a   53%|
|Sat 13| 05:56a  09:29p  15:32 | 10:55p  04:30a |L Qtr Rise 02:48a   43%|
+------+-----------------------+----------------+-----------------------+
|Sun 14| 05:56a  09:30p  15:33 | 10:56p  04:30a |      Rise 03:09a   34%|
|Mon 15| 05:56a  09:30p  15:33 | 10:56p  04:30a |      Rise 03:30a   25%|
|Tue 16| 05:56a  09:30p  15:34 | 10:57p  04:30a |      Rise 03:52a   17%|
|Wed 17| 05:56a  09:31p  15:34 | 10:57p  04:30a |      Rise 04:18a   11%|
|Thu 18| 05:56a  09:31p  15:34 | 10:57p  04:30a |      Rise 04:48a    5%|
|Fri 19| 05:56a  09:31p  15:34 | 10:58p  04:30a |      Rise 05:25a    2%|
|Sat 20| 05:57a  09:31p  15:34 | 10:58p  04:30a |      Rise 06:09a    0%|
+------+-----------------------+----------------+-----------------------+
|Sun 21| 05:57a  09:32p  15:34 | 10:58p  04:30a |New   Set  10:12p    1%|
|Mon 22| 05:57a  09:32p  15:34 | 10:58p  04:31a |      Set  11:04p    3%|
|Tue 23| 05:57a  09:32p  15:34 | 10:58p  04:31a |      Set  11:49p    8%|
|Wed 24| 05:58a  09:32p  15:34 | 10:58p  04:31a |      Set  12:27a   16%|
|Thu 25| 05:58a  09:32p  15:33 | 10:58p  04:32a |      Set  12:59a   24%|
|Fri 26| 05:58a  09:32p  15:33 | 10:58p  04:32a |      Set  01:28a   35%|
|Sat 27| 05:59a  09:32p  15:33 | 10:58p  04:33a |      Set  01:54a   46%|
+------+-----------------------+----------------+-----------------------+
|Sun 28| 05:59a  09:32p  15:32 | 10:58p  04:33a |F Qtr Set  02:19a   58%|
|Mon 29| 06:00a  09:32p  15:31 | 10:57p  04:34a |      Set  02:46a   69%|
|Tue 30| 06:00a  09:32p  15:31 | 10:57p  04:35a |      Set  03:15a   79%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunrise and sunset

 

05/01/2020 – Ephemeris – Previewing May Skies

May 1, 2020 Comments off

This is Bob Moler with Ephemeris for Friday, May 1st. Today the Sun will be up for 14 hours and 16 minutes, setting at 8:48, and it will rise tomorrow at 6:30. The Moon, 1 day past first quarter, will set at 4:22 tomorrow morning.

May is the month when the promise of spring is finally fulfilled. Daylight hours in the Interlochen/Traverse City area will increase from 14 hours and 16 minutes today to 15 hours 20 minutes on the 31st. The altitude, or angle, of the Sun above the southern horizon at local noon will ascend from 60 degrees today to 67 degrees at month’s end. The altitude of the sun in the Straits area will be a degree lower than that but your daylight hours will be a few minutes longer. Venus will end up too close to the Sun to be seen at month’s end, but before then its thin crescent can even be seen in binoculars. Mercury will make an appearance in the evening sky and will appear near Venus on the 22nd. They will be low in the west-northwest in evening twilight.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

May Evening Star Chart

May Evening Star Chart

Star Chart for May 2020 (11 p.m. EDT May 15, 2020). Created using my LookingUp program. Click on image to enlarge.

The planets and stars are plotted for the 15th at 11 p.m. EDT in the evening and 5 a.m. for the morning chart. These are the chart times. Note that Traverse City is located approximately 45 minutes behind our time meridian, West 75° longitude. (An hour 45 minutes behind our daylight saving time meridian during EDT). To duplicate the star positions on a planisphere you may have to set it to 1 hour 45 minutes earlier than the current time.
Note the chart times of 11 p.m. and 5 a.m. are for the 15th. For each week before the 15th add ½ hour (28 minutes if you’re picky). For each week after the 15th subtract ½ hour, or 28 minutes. The planet positions are updated each Wednesday on this blog. For planet positions on dates other than the 15th, check the Wednesday planet posts on this blog for weekly positions.

May Morning Star Chart

May Morning Star Chart

Star Chart for May mornings 2020 (5 a.m. EDT May 15, 2020). Created using my LookingUp program. Click on image to enlarge.

For a list of constellation names to go with the abbreviations click here.

  • Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
  • Leaky dipper drips on Leo
  • Follow the arc of the handle of the Big Dipper to the star Arcturus, and
  • Extend like a spike to Spica,
  • EaqR is the radiant of the Aquariid meteor shower that peaks on the 5th.  Best viewing is before the peak this year due to the bright Moon.

Twilight Limits, Nautical and Astronomical

      EDT        
  Morning twilight Evening twilight Dark night Moon
Date Astro. Nautical Nautical Astro. Start End Illum.
2020-05-01 4h39m 5h24m 22h03m 22h47m 3h48m 4h39m 0.63
2020-05-02 4h37m 5h22m 22h04m 22h49m 4h22m 4h37m 0.74
2020-05-03 4h35m 5h20m 22h06m 22h51m 0.84
2020-05-04 4h33m 5h19m 22h07m 22h53m 0.92
2020-05-05 4h31m 5h17m 22h09m 22h55m 0.92
2020-05-06 4h29m 5h15m 22h11m 22h57m 0.98
2020-05-07 4h27m 5h14m 22h12m 22h59m 1
2020-05-08 4h24m 5h12m 22h14m 23h01m 0.99
2020-05-09 4h22m 5h10m 22h15m 23h03m 23h03m 23h56m 0.95
2020-05-10 4h20m 5h09m 22h17m 23h05m 23h05m 0.89
2020-05-11 4h18m 5h07m 22h18m 23h07m 23h07m 0h58m 0.81
2020-05-12 4h16m 5h06m 22h20m 23h09m 23h09m 1h51m 0.71
2020-05-13 4h14m 5h04m 22h21m 23h11m 23h11m 2h34m 0.61
2020-05-14 4h12m 5h02m 22h23m 23h13m 23h13m 3h08m 0.51
2020-05-15 4h10m 5h01m 22h24m 23h15m 23h15m 3h36m 0.41
2020-05-16 4h08m 5h00m 22h26m 23h17m 23h17m 4h01m 0.31
2020-05-17 4h06m 4h58m 22h27m 23h19m 23h19m 4h06m 0.23
2020-05-18 4h05m 4h57m 22h29m 23h21m 23h21m 4h05m 0.15
2020-05-19 4h03m 4h55m 22h30m 23h23m 23h23m 4h03m 0.09
2020-05-20 4h01m 4h54m 22h32m 23h25m 23h25m 4h01m 0.04
2020-05-21 3h59m 4h53m 22h33m 23h27m 23h27m 3h59m 0.01
2020-05-22 3h57m 4h52m 22h35m 23h29m 23h29m 3h57m 0
2020-05-23 3h56m 4h50m 22h36m 23h31m 23h31m 3h56m 0.01
2020-05-24 3h54m 4h49m 22h37m 23h33m 23h33m 3h54m 0.04
2020-05-25 3h52m 4h48m 22h39m 23h34m 3h52m 0.1
2020-05-26 3h51m 4h47m 22h40m 23h36m 0h18m 3h51m 0.17
2020-05-27 3h49m 4h46m 22h41m 23h38m 1h08m 3h49m 0.26
2020-05-28 3h48m 4h45m 22h42m 23h40m 1h50m 3h48m 0.37
2020-05-29 3h46m 4h44m 22h44m 23h42m 2h25m 3h46m 0.48
2020-05-30 3h45m 4h43m 22h45m 23h43m 2h56m 3h45m 0.6
2020-05-31 3h43m 4h42m 22h46m 23h45m 3h23m 3h43m 0.72

The twilight calendar was generated using Cartes du Ciel (Sky Charts), with some corrections.

See my blog post: Twilight Zone for the definitions of the different periods of twilight here: https://bobmoler.wordpress.com/2018/09/27/.

NASA Calendar of Planetary Events

May 1  Fr            Venus: 38° E
    5  Mo  03:00 am  Eta Aquariid Meteor Shower: ZHR = 60
    4  Mo  05:22 pm  Mercury Superior Solar Conjunction
    5  Tu  11:03 pm  Moon Perigee: 359700 km
    7  Th  06:45 am  Full Moon
   10  Su  05:01 am  Moon Descending Node
   11  Mo  02:13 am  Moon South Dec.: 24° S
   12  Tu  05:40 am  Moon-Jupiter: 2.4° N
   12  Tu  02:18 pm  Moon-Saturn: 2.8° N
   14  Th  10:03 am  Last Quarter
   14  Th  10:01 pm  Moon-Mars: 3° N
   18  Mo  03:45 am  Moon Apogee: 405600 km
   22  Fr  05:37 am  Mercury-Venus: 0.9° N
   22  Fr  01:39 pm  New Moon
   23  Sa  10:40 pm  Moon-Venus: 4° N
   24  Su  06:53 am  Moon-Mercury: 3° N
   24  Su  05:34 pm  Moon Ascending Node
   25  Mo  05:16 pm  Moon North Dec.: 24.1° N
   27  We  02:44 pm  Moon-Beehive: 1.8° S
   29  Fr  11:30 pm  First Quarter
Jun 1  Mo            Venus: 3.7° E

All event times are given for UTC-4 hr: Daylight Saving Time.

Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC),
http://eclipse.gsfc.nasa.gov/SKYCAL/SKYCAL.html.

If you go to the above site you can print out a list like the above for the entire year or calendar pages for your time zone.

Sun and Moon Rising and Setting Events

LU Ephemeris of Sky Events for Interlochen/TC

May, 2020    Local time zone: EDT
+-----------------------------------------------------------------------+
| DATE |  SUN     SUN  DAYLIGHT|   TWILIGHT*    |MOON  RISE OR    ILLUM |
|      |  RISE    SET    HOURS |  END    START  |PHASE SET** TIME FRACTN|
+=======================================================================+
|Fri  1| 06:32a  08:48p  14:16 | 10:00p  05:19a |      Set  04:22a   63%|
|Sat  2| 06:30a  08:49p  14:19 | 10:02p  05:18a |      Set  04:52a   73%|
+------+-----------------------+----------------+-----------------------+
|Sun  3| 06:29a  08:50p  14:21 | 10:04p  05:16a |      Set  05:20a   83%|
|Mon  4| 06:27a  08:52p  14:24 | 10:05p  05:14a |      Set  05:47a   91%|
|Tue  5| 06:26a  08:53p  14:26 | 10:07p  05:12a |      Set  06:15a   97%|
|Wed  6| 06:25a  08:54p  14:29 | 10:08p  05:11a |      Set  06:46a  100%|
|Thu  7| 06:23a  08:55p  14:32 | 10:10p  05:09a |Full  Rise 09:26p   99%|
|Fri  8| 06:22a  08:56p  14:34 | 10:11p  05:07a |      Rise 10:43p   97%|
|Sat  9| 06:21a  08:58p  14:36 | 10:13p  05:06a |      Rise 11:55p   91%|
+------+-----------------------+----------------+-----------------------+
|Sun 10| 06:19a  08:59p  14:39 | 10:14p  05:04a |      Rise 12:58a   84%|
|Mon 11| 06:18a  09:00p  14:41 | 10:16p  05:02a |      Rise 01:51a   75%|
|Tue 12| 06:17a  09:01p  14:44 | 10:18p  05:01a |      Rise 02:33a   66%|
|Wed 13| 06:16a  09:02p  14:46 | 10:19p  04:59a |      Rise 03:08a   56%|
|Thu 14| 06:15a  09:03p  14:48 | 10:21p  04:58a |L Qtr Rise 03:36a   46%|
|Fri 15| 06:14a  09:04p  14:50 | 10:22p  04:56a |      Rise 04:01a   36%|
|Sat 16| 06:12a  09:06p  14:53 | 10:24p  04:55a |      Rise 04:23a   28%|
+------+-----------------------+----------------+-----------------------+
|Sun 17| 06:11a  09:07p  14:55 | 10:25p  04:53a |      Rise 04:43a   20%|
|Mon 18| 06:10a  09:08p  14:57 | 10:27p  04:52a |      Rise 05:04a   13%|
|Tue 19| 06:09a  09:09p  14:59 | 10:28p  04:51a |      Rise 05:25a    7%|
|Wed 20| 06:08a  09:10p  15:01 | 10:29p  04:49a |      Rise 05:49a    3%|
|Thu 21| 06:08a  09:11p  15:03 | 10:31p  04:48a |      Rise 06:16a    1%|
|Fri 22| 06:07a  09:12p  15:05 | 10:32p  04:47a |New   Set  09:16p    0%|
|Sat 23| 06:06a  09:13p  15:07 | 10:34p  04:46a |      Set  10:20p    2%|
+------+-----------------------+----------------+-----------------------+
|Sun 24| 06:05a  09:14p  15:09 | 10:35p  04:44a |      Set  11:22p    5%|
|Mon 25| 06:04a  09:15p  15:10 | 10:36p  04:43a |      Set  12:18a   11%|
|Tue 26| 06:03a  09:16p  15:12 | 10:38p  04:42a |      Set  01:07a   18%|
|Wed 27| 06:03a  09:17p  15:14 | 10:39p  04:41a |      Set  01:49a   27%|
|Thu 28| 06:02a  09:18p  15:15 | 10:40p  04:40a |      Set  02:25a   37%|
|Fri 29| 06:01a  09:19p  15:17 | 10:41p  04:39a |F Qtr Set  02:55a   48%|
|Sat 30| 06:01a  09:20p  15:18 | 10:43p  04:38a |      Set  03:23a   60%|
+------+-----------------------+----------------+-----------------------+
|Sun 31| 06:00a  09:20p  15:20 | 10:44p  04:37a |      Set  03:49a   71%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunrise and sunset

 

03/31/2020 – Ephemeris – Looking ahead at April skies

March 31, 2020 Comments off

Ephemeris for Tuesday, March 31st. Today the Sun will be up for 12 hours and 45 minutes, setting at 8:09, and it will rise tomorrow at 7:22. The Moon, 1 day before first quarter, will set at 3:30 tomorrow morning.

The 4th month of the year begins tomorrow. Daylight hours in the Interlochen/Traverse City area and will increase from 12 hours and 48 minutes tomorrow to 14 hours 13 minutes on the 30th. The altitude, or angle, of the Sun above the southern horizon at local noon will be 50 degrees tomorrow and will ascend to 60 degrees on the 30th. The altitude of the Sun in the Straits area will be a degree lower. The actual time of local apparent noon this month for the Interlochen/Traverse City area, when the Sun passes due south, will be about 1:43 p.m. Venus is our brilliant evening planet while Jupiter, Saturn and Mars are our morning planets with Mars passing below Saturn unseen by us this afternoon.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

March Evening Star Chart

April Evening Star Chart

Star Chart for April 2020 (10 p.m. EDT April 15, 2020). Click on image to enlarge. Created using my LookingUp program.

The planets and stars are plotted for the 15th at 10 p.m. EDT in the evening and 5 a.m. for the morning chart. These are the chart times. The brilliant planet Venus is our Evening Star in the West at chart time. Note that Traverse City is located approximately 45 minutes behind our time meridian, West 75° longitude. (An hour and 45 minutes behind our daylight saving time meridian during EDT).

April Morning Star Chart

April Morning Star Chart

Star Chart for April mornings 2020 (5 a.m. EDT April 15, 2020). Click on image to enlarge. Created using my LookingUp program.

For a list of constellation names to go with the abbreviations click here.

  • Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
  • The leaky bowl of the Big Dipper drips on Leo.
  • Follow the arc of the handle of the Big Dipper to the star Arcturus, then
  • Follow the spike to Spica.
  • The Summer Triangle appears in red.
  • LyrR is the radiant of the Lyrid meteor shower which will reach peak on the morning of the 22nd.

Twilight Limits, Nautical and Astronomical

      EDT        
  Morning twilight Evening twilight Dark night Moon
Date Astro. Nautical Nautical Astro. Start End Illum.
2020-04-01 5h45m 6h22m 21h18m 21h55m 3h31m 5h45m 0.56
2020-04-02 5h43m 6h20m 21h19m 21h56m 4h24m 5h43m 0.67
2020-04-03 5h41m 6h18m 21h21m 21h58m 5h09m 5h41m 0.78
2020-04-04 5h39m 6h16m 21h22m 21h59m 0.87
2020-04-05 5h37m 6h14m 21h24m 22h01m 0.87
2020-04-06 5h35m 6h12m 21h25m 22h03m 0.94
2020-04-07 5h32m 6h10m 21h26m 22h04m 0.99
2020-04-08 5h30m 6h08m 21h28m 22h06m 1
2020-04-09 5h28m 6h06m 21h29m 22h08m 22h08m 22h36m 0.98
2020-04-10 5h26m 6h04m 21h31m 22h09m 22h09m 23h54m 0.93
2020-04-11 5h24m 6h02m 21h32m 22h11m 22h11m 0.85
2020-04-12 5h21m 6h00m 21h34m 22h13m 22h13m 1h07m 0.76
2020-04-13 5h19m 5h58m 21h35m 22h14m 22h14m 2h13m 0.66
2020-04-14 5h17m 5h56m 21h37m 22h16m 22h16m 3h09m 0.55
2020-04-15 5h15m 5h54m 21h38m 22h18m 22h18m 3h56m 0.44
2020-04-16 5h12m 5h52m 21h40m 22h20m 22h20m 4h34m 0.34
2020-04-17 5h10m 5h50m 21h41m 22h21m 22h21m 5h05m 0.25
2020-04-18 5h08m 5h48m 21h43m 22h23m 22h23m 5h08m 0.17
2020-04-19 5h06m 5h46m 21h44m 22h25m 22h25m 5h06m 0.11
2020-04-20 5h04m 5h44m 21h46m 22h27m 22h27m 5h04m 0.05
2020-04-21 5h01m 5h43m 21h47m 22h29m 22h29m 5h01m 0.02
2020-04-22 4h59m 5h41m 21h49m 22h30m 22h30m 4h59m 0
2020-04-23 4h57m 5h39m 21h50m 22h32m 22h32m 4h57m 0
2020-04-24 4h55m 5h37m 21h52m 22h34m 22h34m 4h55m 0.03
2020-04-25 4h52m 5h35m 21h53m 22h36m 23h25m 4h52m 0.07
2020-04-26 4h50m 5h33m 21h55m 22h38m 4h50m 0.13
2020-04-27 4h48m 5h31m 21h57m 22h40m 0h28m 4h48m 0.21
2020-04-28 4h46m 5h29m 21h58m 22h42m 1h27m 4h46m 0.3
2020-04-29 4h44m 5h28m 22h00m 22h44m 2h21m 4h44m 0.4
2020-04-30 4h42m 5h26m 22h01m 22h45m 3h08m 4h42m 0.52

Twilight calendar was generated using Cartes du Ciel (Sky Charts).

See my blog post: Twilight Zone for the definitions of the different periods of twilight here: https://bobmoler.wordpress.com/2018/09/27/.

NASA Calendar of Planetary Events

   Date      Time    Event
Apr 1  We  05:12 am  Moon North Dec.: 23.7° N
    1  We  06:21 am  First Quarter
    1  We            Venus: 45.9° E
    3  Fr  02:24 am  Moon-Beehive: 1.3° S
    3  Fr  10:39 am  Venus-Pleiades: 0.3° S
    7  Tu  02:08 pm  Moon Perigee: 356900 km
    7  Tu  10:35 pm  Full Moon (super moon)
   12  Su  10:58 pm  Moon Descending Node
   13  Mo  05:03 pm  Moon South Dec.: 23.8° S
   14  Tu  06:56 pm  Last Quarter
   14  Tu  07:04 pm  Moon-Jupiter: 2.1° N
   15  We  05:26 am  Moon-Saturn: 2.6° N
   16  Th  12:33 am  Moon-Mars: 2.2° N
   20  Mo  03:01 pm  Moon Apogee: 406500 km
   22  We  02:07 am  Lyrid Meteor Shower: ZHR = 20
   22  We  10:26 pm  New Moon
   26  Su  06:19 am  Uranus Conjunction
   26  Su  11:23 am  Moon-Venus: 6.6° N
   27  Mo  01:54 pm  Moon Ascending Node
   27  Mo            Venus greatest brilliancy
   28  Tu  11:23 am  Moon North Dec.: 23.9° N
   30  Th  09:17 am  Moon-Beehive: 1.6° S
   30  Th  04:38 pm  First Quarter
May 1  Fr            Venus: 38° E

Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC),
http://eclipse.gsfc.nasa.gov/SKYCAL/SKYCAL.html.

Sun and Moon Rising and Setting Events

LU                  Ephemeris of Sky Events for Interlochen/TC
April, 2020    Local time zone: EDT
+-----------------------------------------------------------------------+
| DATE |  SUN     SUN  DAYLIGHT|   TWILIGHT*    |MOON  RISE OR    ILLUM |
|      |  RISE    SET    HOURS |  END    START  |PHASE SET** TIME FRACTN|
+=======================================================================+
|Wed  1| 07:22a  08:11p  12:48 | 09:15p  06:18a |F Qtr Set  04:23a   56%|
|Thu  2| 07:20a  08:12p  12:51 | 09:17p  06:16a |      Set  05:09a   67%|
|Fri  3| 07:18a  08:13p  12:54 | 09:18p  06:14a |      Set  05:48a   77%|
|Sat  4| 07:17a  08:14p  12:57 | 09:20p  06:12a |      Set  06:22a   86%|
+------+-----------------------+----------------+-----------------------+
|Sun  5| 07:15a  08:16p  13:00 | 09:21p  06:10a |      Set  06:53a   93%|
|Mon  6| 07:13a  08:17p  13:03 | 09:23p  06:08a |      Set  07:21a   98%|
|Tue  7| 07:11a  08:18p  13:06 | 09:24p  06:06a |Full  Rise 07:55p  100%|
|Wed  8| 07:09a  08:19p  13:09 | 09:25p  06:04a |      Rise 09:16p   99%|
|Thu  9| 07:08a  08:21p  13:12 | 09:27p  06:02a |      Rise 10:36p   95%|
|Fri 10| 07:06a  08:22p  13:15 | 09:28p  06:00a |      Rise 11:54p   88%|
|Sat 11| 07:04a  08:23p  13:19 | 09:30p  05:58a |      Rise 01:07a   80%|
+------+-----------------------+----------------+-----------------------+
|Sun 12| 07:02a  08:24p  13:22 | 09:31p  05:56a |      Rise 02:13a   70%|
|Mon 13| 07:01a  08:26p  13:25 | 09:33p  05:54a |      Rise 03:09a   60%|
|Tue 14| 06:59a  08:27p  13:28 | 09:34p  05:52a |L Qtr Rise 03:56a   50%|
|Wed 15| 06:57a  08:28p  13:30 | 09:36p  05:50a |      Rise 04:34a   40%|
|Thu 16| 06:55a  08:29p  13:33 | 09:37p  05:48a |      Rise 05:05a   30%|
|Fri 17| 06:54a  08:31p  13:36 | 09:39p  05:46a |      Rise 05:32a   22%|
|Sat 18| 06:52a  08:32p  13:39 | 09:40p  05:44a |      Rise 05:55a   15%|
+------+-----------------------+----------------+-----------------------+
|Sun 19| 06:50a  08:33p  13:42 | 09:42p  05:42a |      Rise 06:17a    9%|
|Mon 20| 06:49a  08:34p  13:45 | 09:43p  05:40a |      Rise 06:37a    4%|
|Tue 21| 06:47a  08:36p  13:48 | 09:45p  05:38a |      Rise 06:58a    1%|
|Wed 22| 06:45a  08:37p  13:51 | 09:46p  05:36a |New   Set  08:15p    0%|
|Thu 23| 06:44a  08:38p  13:54 | 09:48p  05:34a |      Set  09:18p    1%|
|Fri 24| 06:42a  08:39p  13:57 | 09:50p  05:32a |      Set  10:21p    3%|
|Sat 25| 06:41a  08:41p  13:59 | 09:51p  05:30a |      Set  11:25p    8%|
+------+-----------------------+----------------+-----------------------+
|Sun 26| 06:39a  08:42p  14:02 | 09:53p  05:29a |      Set  12:27a   14%|
|Mon 27| 06:37a  08:43p  14:05 | 09:54p  05:27a |      Set  01:26a   22%|
|Tue 28| 06:36a  08:44p  14:08 | 09:56p  05:25a |      Set  02:20a   31%|
|Wed 29| 06:34a  08:45p  14:11 | 09:57p  05:23a |      Set  03:07a   41%|
|Thu 30| 06:33a  08:47p  14:13 | 09:59p  05:21a |F Qtr Set  03:47a   52%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunrise and sunset

Generated using my LookingUp for DOS program.