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Archive for September 1, 2020

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.