Archive
04/01/2021 – Ephemeris – Previewing April Skies
This is Bob Moler with Ephemeris for Wednesday, March 31st. Today the Sun will be up for 12 hours and 44 minutes, setting at 8:09, and it will rise tomorrow at 7:23. The Moon, 3 days past full, will rise at 12:11 tomorrow morning.
Let’s search for the naked-eye planets for this week. Unfortunately the only one you’ll find in the evening is Mars. It can be found in the west-southwest at 9 pm tonight, above the orange star Aldebaran in the face of Taurus the bull. Mars will set at 1:54 am. Right now three of the other four naked eye planets are just west of the Sun in the Morning sky. Venus is now below and just a bit east of the Sun, setting four minutes after sunset. Only Saturn and Jupiter are at a far enough angle from the Sun to be just spotted in the morning twilight. Saturn will rise at 5:10 am, with Jupiter rising 31 minutes later. By 6:30 am they will be low in the southeast. The Sun is rising earlier by 2 minutes a day now, while sunset is nearly matching that pace in the opposite direction.
The astronomical event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum
April Evening Star Chart

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

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.
- the 22nd.
Twilight Limits, Nautical and Astronomical
Morning | Twilight | Evening | Twilight | Dark | Night | Moon | |
Date | Astro. | Nautical | Nautical | Astro. | Start | End | Illum. |
2021-04-01 | 5h46m | 6h23m | 21h18m | 21h54m | 21h54m | 0h11m | 0.74 |
2021-04-02 | 5h44m | 6h21m | 21h19m | 21h56m | 21h56m | 1h29m | 0.64 |
2021-04-03 | 5h42m | 6h19m | 21h20m | 21h57m | 21h57m | 2h42m | 0.52 |
2021-04-04 | 5h39m | 6h17m | 21h22m | 21h59m | 21h59m | 3h44m | 0.42 |
2021-04-05 | 5h37m | 6h15m | 21h23m | 22h01m | 22h01m | 4h35m | 0.31 |
2021-04-06 | 5h35m | 6h13m | 21h25m | 22h02m | 22h02m | 5h16m | 0.22 |
2021-04-07 | 5h33m | 6h11m | 21h26m | 22h04m | 22h04m | 5h33m | 0.14 |
2021-04-08 | 5h31m | 6h09m | 21h27m | 22h05m | 22h05m | 5h31m | 0.08 |
2021-04-09 | 5h28m | 6h07m | 21h29m | 22h07m | 22h07m | 5h28m | 0.03 |
2021-04-10 | 5h26m | 6h05m | 21h30m | 22h09m | 22h09m | 5h26m | 0.01 |
2021-04-11 | 5h24m | 6h03m | 21h32m | 22h10m | 22h10m | 5h24m | 0 |
2021-04-12 | 5h22m | 6h01m | 21h33m | 22h12m | 22h12m | 5h22m | 0.01 |
2021-04-13 | 5h20m | 5h59m | 21h35m | 22h14m | 22h14m | 5h20m | 0.04 |
2021-04-14 | 5h17m | 5h57m | 21h36m | 22h16m | 23h12m | 5h17m | 0.08 |
2021-04-15 | 5h15m | 5h55m | 21h38m | 22h17m | – | 5h15m | 0.14 |
2021-04-16 | 5h13m | 5h53m | 21h39m | 22h19m | 0h14m | 5h13m | 0.22 |
2021-04-17 | 5h11m | 5h51m | 21h41m | 22h21m | 1h15m | 5h11m | 0.3 |
2021-04-18 | 5h09m | 5h49m | 21h42m | 22h23m | 2h12m | 5h09m | 0.39 |
2021-04-19 | 5h06m | 5h47m | 21h44m | 22h24m | 3h03m | 5h06m | 0.49 |
2021-04-20 | 5h04m | 5h45m | 21h45m | 22h26m | 3h47m | 5h04m | 0.59 |
2021-04-21 | 5h02m | 5h43m | 21h47m | 22h28m | 4h25m | 5h02m | 0.7 |
2021-04-22 | 5h00m | 5h41m | 21h48m | 22h30m | 4h56m | 5h00m | 0.79 |
2021-04-23 | 4h57m | 5h39m | 21h50m | 22h32m | – | – | 0.88 |
2021-04-24 | 4h55m | 5h37m | 21h51m | 22h34m | – | – | 0.94 |
2021-04-25 | 4h53m | 5h35m | 21h53m | 22h35m | – | – | 0.99 |
2021-04-26 | 4h51m | 5h34m | 21h55m | 22h37m | – | – | 1 |
2021-04-27 | 4h49m | 5h32m | 21h56m | 22h39m | – | – | 0.98 |
2021-04-28 | 4h46m | 5h30m | 21h58m | 22h41m | 22h41m | 23h06m | 0.94 |
2021-04-29 | 4h44m | 5h28m | 21h59m | 22h43m | 22h43m | – | 0.87 |
2021-04-30 | 4h42m | 5h26m | 22h01m | 22h45m | 22h45m | 0h25m | 0.78 |
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 Th Venus: 2° E 1 Th 10:41 pm Moon Descending Node 3 Sa 10:08 pm Moon South Dec.: 25.4° S 4 Su 6:02 am Last Quarter 6 Tu 4:34 am Moon-Saturn: 4.2° N 7 We 3:15 am Moon-Jupiter: 4.7° N 11 Su 10:31 pm New Moon 14 We 1:47 pm Moon Apogee: 406100 km 16 Fr 1:53 am Moon Ascending Node 17 Sa 8:09 am Moon-Mars: 0.1° N, Occultation Africa-Asia 18 Su 12:02 pm Moon North Dec.: 25.5° N 18 Su 9:31 pm Mercury Superior Conj. 20 Tu 2:59 am First Quarter 20 Tu 2:25 pm Moon-Beehive: 3° S 22 Th 8:16 am Lyrid Shower: ZHR = 20 26 Mo 11:31 pm Full Moon - Supermoon 27 Tu 11:24 am Moon Perigee: 357400 km 29 Th 5:17 am Moon Descending Node 30 Fr 5:15 pm Uranus Conjunction May 1 Sa Venus: 9.4° 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
Ephemeris of Sky Events for Interlochen/TC
April, 2021 Local time zone: EDT
+-----------------------------------------------------------------------+
| DATE | SUN SUN DAYLIGHT| TWILIGHT* |MOON RISE OR ILLUM |
| | RISE SET HOURS | END START |PHASE SET** TIME FRACTN|
+=======================================================================+
|Thu 1| 07:23a 08:10p 12:47 | 09:15p 06:18a | Rise 01:29a 76%|
|Fri 2| 07:21a 08:12p 12:50 | 09:17p 06:16a | Rise 02:42a 66%|
|Sat 3| 07:19a 08:13p 12:53 | 09:18p 06:14a | Rise 03:44a 55%|
+------+-----------------------+----------------+-----------------------+
|Sun 4| 07:17a 08:14p 12:56 | 09:19p 06:12a |L Qtr Rise 04:35a 44%|
|Mon 5| 07:15a 08:15p 13:00 | 09:21p 06:10a | Rise 05:15a 33%|
|Tue 6| 07:13a 08:17p 13:03 | 09:22p 06:08a | Rise 05:48a 24%|
|Wed 7| 07:12a 08:18p 13:06 | 09:24p 06:06a | Rise 06:14a 16%|
|Thu 8| 07:10a 08:19p 13:09 | 09:25p 06:04a | Rise 06:37a 9%|
|Fri 9| 07:08a 08:20p 13:12 | 09:27p 06:02a | Rise 06:57a 4%|
|Sat 10| 07:06a 08:22p 13:15 | 09:28p 06:00a | Rise 07:17a 1%|
+------+-----------------------+----------------+-----------------------+
|Sun 11| 07:05a 08:23p 13:18 | 09:30p 05:58a |New Set 08:03p 0%|
|Mon 12| 07:03a 08:24p 13:21 | 09:31p 05:56a | Set 09:05p 1%|
|Tue 13| 07:01a 08:25p 13:24 | 09:32p 05:54a | Set 10:08p 3%|
|Wed 14| 06:59a 08:27p 13:27 | 09:34p 05:52a | Set 11:11p 7%|
|Thu 15| 06:58a 08:28p 13:30 | 09:35p 05:50a | Set 12:14a 13%|
|Fri 16| 06:56a 08:29p 13:33 | 09:37p 05:48a | Set 01:15a 20%|
|Sat 17| 06:54a 08:30p 13:36 | 09:38p 05:46a | Set 02:12a 28%|
+------+-----------------------+----------------+-----------------------+
|Sun 18| 06:52a 08:32p 13:39 | 09:40p 05:44a | Set 03:03a 37%|
|Mon 19| 06:51a 08:33p 13:42 | 09:41p 05:42a | Set 03:47a 47%|
|Tue 20| 06:49a 08:34p 13:44 | 09:43p 05:40a |F Qtr Set 04:24a 57%|
|Wed 21| 06:47a 08:35p 13:47 | 09:45p 05:38a | Set 04:56a 67%|
|Thu 22| 06:46a 08:37p 13:50 | 09:46p 05:37a | Set 05:24a 77%|
|Fri 23| 06:44a 08:38p 13:53 | 09:48p 05:35a | Set 05:49a 86%|
|Sat 24| 06:43a 08:39p 13:56 | 09:49p 05:33a | Set 06:14a 93%|
+------+-----------------------+----------------+-----------------------+
|Sun 25| 06:41a 08:40p 13:59 | 09:51p 05:31a | Set 06:39a 98%|
|Mon 26| 06:39a 08:41p 14:02 | 09:52p 05:29a |Full Rise 08:19p 100%|
|Tue 27| 06:38a 08:43p 14:04 | 09:54p 05:27a | Rise 09:43p 99%|
|Wed 28| 06:36a 08:44p 14:07 | 09:55p 05:25a | Rise 11:06p 95%|
|Thu 29| 06:35a 08:45p 14:10 | 09:57p 05:23a | Rise 12:25a 88%|
|Fri 30| 06:33a 08:46p 14:13 | 09:59p 05:22a | Rise 01:34a 80%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunrise and sunset
Generated using my LookingUp for DOS program.
02/01/2021 – Ephemeris – Previewing February Skies
This is Ephemeris for Monday, February 1st. Today the Sun will be up for 9 hours and 50 minutes, setting at 5:51, and it will rise tomorrow at 8:00. The Moon, 3 days before last quarter, will rise at 10:33 this evening. | February is the shortest month, even so the daylight hours throughout the month will be getting longer. Daylight hours will increase from 9 hours and 50 minutes today to 11 hours and 7 minutes on the 28th. The sunrise time will decrease from 8:01 today to 7:21 at months end. The sunset times will increase from 5:51 today to 6:29 on the 28th. Along with that the altitude of the Sun at noon will increase from 28.4 degrees today to 37.6 degrees at month’s end. It will be a degree lower for folks in the Straits area because they are a degree of latitude farther north. Local noon, by the way for Interlochen and Traverse City is about 12:56 p.m.
The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum

Star Chart for February 2021 (9 p.m. EST February 15, 2021). Created using my LookingUp program. Click on image to enlarge.
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. (An hour 45 minutes behind our daylight saving time meridian during EDT). To duplicate the star positions on a planisphere (rotating star finder) you may have to set it to 1 hour 45 minutes earlier than the current time.
Note the chart times of 9 p.m. and 6 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.
February Morning Star Chart

Star Chart for February mornings 2021 (6 a.m. EST February 15, 2021). 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.
- 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
EST | |||||||
Morning twilight | Evening twilight | Dark night | Moon | ||||
Date | Astro. | Nautical | Nautical | Astro. | Start | End | Illum. |
2021-02-01 | 6h22m | 6h56m | 18h56m | 19h30m | 19h30m | 22h33m | 0.78 |
2021-02-02 | 6h21m | 6h55m | 18h57m | 19h31m | 19h31m | 23h48m | 0.67 |
2021-02-03 | 6h20m | 6h54m | 18h59m | 19h33m | 19h33m | – | 0.56 |
2021-02-04 | 6h19m | 6h53m | 19h00m | 19h34m | 19h34m | 1h03m | 0.45 |
2021-02-05 | 6h18m | 6h52m | 19h01m | 19h35m | 19h35m | 2h20m | 0.34 |
2021-02-06 | 6h16m | 6h50m | 19h02m | 19h36m | 19h36m | 3h35m | 0.23 |
2021-02-07 | 6h15m | 6h49m | 19h04m | 19h38m | 19h38m | 4h48m | 0.15 |
2021-02-08 | 6h14m | 6h48m | 19h05m | 19h39m | 19h39m | 5h54m | 0.08 |
2021-02-09 | 6h13m | 6h47m | 19h06m | 19h40m | 19h40m | 6h13m | 0.03 |
2021-02-10 | 6h12m | 6h46m | 19h08m | 19h41m | 19h41m | 6h12m | 0 |
2021-02-11 | 6h10m | 6h44m | 19h09m | 19h43m | 19h43m | 6h10m | 0 |
2021-02-12 | 6h09m | 6h43m | 19h10m | 19h44m | 19h44m | 6h09m | 0.02 |
2021-02-13 | 6h08m | 6h42m | 19h11m | 19h45m | 20h14m | 6h08m | 0.06 |
2021-02-14 | 6h06m | 6h40m | 19h13m | 19h47m | 21h19m | 6h06m | 0.12 |
2021-02-15 | 6h05m | 6h39m | 19h14m | 19h48m | 22h22m | 6h05m | 0.19 |
2021-02-16 | 6h04m | 6h37m | 19h15m | 19h49m | 23h25m | 6h04m | 0.27 |
2021-02-17 | 6h02m | 6h36m | 19h17m | 19h50m | – | 6h02m | 0.35 |
2021-02-18 | 6h01m | 6h34m | 19h18m | 19h52m | 0h27m | 6h01m | 0.45 |
2021-02-19 | 5h59m | 6h33m | 19h19m | 19h53m | 1h30m | 5h59m | 0.54 |
2021-02-20 | 5h58m | 6h32m | 19h21m | 19h54m | 2h33m | 5h58m | 0.64 |
2021-02-21 | 5h56m | 6h30m | 19h22m | 19h56m | 3h35m | 5h56m | 0.73 |
2021-02-22 | 5h55m | 6h28m | 19h23m | 19h57m | 4h34m | 5h55m | 0.81 |
2021-02-23 | 5h53m | 6h27m | 19h24m | 19h58m | 5h28m | 5h53m | 0.89 |
2021-02-24 | 5h52m | 6h25m | 19h26m | 19h59m | – | – | 0.94 |
2021-02-25 | 5h50m | 6h24m | 19h27m | 20h01m | – | – | 0.98 |
2021-02-26 | 5h48m | 6h22m | 19h28m | 20h02m | – | – | 1 |
2021-02-27 | 5h47m | 6h20m | 19h30m | 20h03m | – | – | 0.99 |
2021-02-28 | 5h45m | 6h19m | 19h31m | 20h05m | 20h05m | 20h16m | 0.95 |
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/2019/09/27/
NASA Calendar of Planetary Events
Date Time Event Feb 1 Mo Venus: 13° W 3 We 2:33 pm Moon Perigee: 370,100 km 4 Th 12:37 pm Last Quarter 6 Sa 7:29 pm Moon Descending Node 8 Mo 8:39 am Mercury Inferior Conjunction 8 Mo 10:34 am Moon South Dec.: 25° S 11 Th 2:06 pm New Moon 18 Th 5:22 am Moon Apogee: 404,500 km 18 Th 5:47 pm Moon-Mars: 4.1° N 19 Fr 1:47 pm First Quarter 20 Sa 8:44 pm Moon Ascending Node 22 Mo 7:12 pm Moon North Dec.: 25.1° N 23 Tu 2:38 am Mercury-Saturn: 4° N 24 We 7:16 pm Moon-Beehive: 2.5° S 27 Sa 3:17 am Full Moon
All event times are given for UTC-5:00: Eastern Standard or Daylight 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 February, 2021 Local time zone: EST +-----------------------------------------------------------------------+ | DATE | SUN SUN DAYLIGHT| TWILIGHT* |MOON RISE OR ILLUM | | | RISE SET HOURS | END START |PHASE SET** TIME FRACTN| +=======================================================================+ |Mon 1| 08:01a 05:51p 09:50 | 06:57p 06:55a | Rise 10:33p 79%| |Tue 2| 08:00a 05:53p 09:53 | 06:59p 06:54a | Rise 11:48p 69%| |Wed 3| 07:59a 05:54p 09:55 | 07:00p 06:53a | Rise 01:03a 58%| |Thu 4| 07:57a 05:56p 09:58 | 07:01p 06:52a |L Qtr Rise 02:19a 47%| |Fri 5| 07:56a 05:57p 10:00 | 07:03p 06:51a | Rise 03:35a 36%| |Sat 6| 07:55a 05:59p 10:03 | 07:04p 06:50a | Rise 04:48a 25%| +------+-----------------------+----------------+-----------------------+ |Sun 7| 07:54a 06:00p 10:06 | 07:05p 06:48a | Rise 05:53a 16%| |Mon 8| 07:52a 06:01p 10:09 | 07:06p 06:47a | Rise 06:49a 9%| |Tue 9| 07:51a 06:03p 10:11 | 07:08p 06:46a | Rise 07:35a 4%| |Wed 10| 07:49a 06:04p 10:14 | 07:09p 06:45a | Rise 08:11a 1%| |Thu 11| 07:48a 06:06p 10:17 | 07:10p 06:43a |New Set 05:57p 0%| |Fri 12| 07:47a 06:07p 10:20 | 07:12p 06:42a | Set 07:07p 2%| |Sat 13| 07:45a 06:08p 10:23 | 07:13p 06:41a | Set 08:14p 5%| +------+-----------------------+----------------+-----------------------+ |Sun 14| 07:44a 06:10p 10:26 | 07:14p 06:39a | Set 09:19p 11%| |Mon 15| 07:42a 06:11p 10:29 | 07:15p 06:38a | Set 10:22p 17%| |Tue 16| 07:41a 06:13p 10:32 | 07:17p 06:37a | Set 11:24p 25%| |Wed 17| 07:39a 06:14p 10:34 | 07:18p 06:35a | Set 12:27a 34%| |Thu 18| 07:38a 06:15p 10:37 | 07:19p 06:34a | Set 01:30a 43%| |Fri 19| 07:36a 06:17p 10:40 | 07:21p 06:32a |F Qtr Set 02:32a 52%| |Sat 20| 07:34a 06:18p 10:43 | 07:22p 06:31a | Set 03:34a 61%| +------+-----------------------+----------------+-----------------------+ |Sun 21| 07:33a 06:20p 10:46 | 07:23p 06:29a | Set 04:33a 71%| |Mon 22| 07:31a 06:21p 10:49 | 07:25p 06:28a | Set 05:28a 79%| |Tue 23| 07:30a 06:22p 10:52 | 07:26p 06:26a | Set 06:15a 87%| |Wed 24| 07:28a 06:24p 10:55 | 07:27p 06:25a | Set 06:56a 93%| |Thu 25| 07:26a 06:25p 10:58 | 07:28p 06:23a | Set 07:30a 98%| |Fri 26| 07:24a 06:26p 11:01 | 07:30p 06:21a | Set 07:59a 100%| |Sat 27| 07:23a 06:28p 11:05 | 07:31p 06:20a |Full Rise 06:59p 99%| +------+-----------------------+----------------+-----------------------+ |Sun 28| 07:21a 06:29p 11:08 | 07:32p 06:18a | Rise 08:16p 96%| +-----------------------------------------------------------------------+ * Nautical Twilight ** Moonrise or moonset, whichever occurs between sunrise and sunset
Created using my LookingUp for DOS output as HTML.
01/04/2021 – Ephemeris – A belated preview of January skies
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
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

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
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
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

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

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
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

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

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
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

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

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
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

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

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
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

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

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)
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

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

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