Archive

Archive for October 1, 2019

10-01-2019 – Ephemeris – Previewing October skies

October 1, 2019 Comments off

Ephemeris for Tuesday, October 1st. Today the Sun will be up for 11 hours and 43 minutes, setting at 7:23, and it will rise tomorrow at 7:41. The Moon, 3 days past new, will set at 9:28 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 will drop from 11 hours and 43 minutes today to 10 hours 14 minutes on the 31st. 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. in Interlochen. The planets Saturn and Jupiter will appear low in the southwest in the early evening, and Venus just might be visible low in the west-southwest a half hour after sunset by month’s end.

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

Addendum

October Evening Star Chart

October Evening Star Chart

Star Chart for October 2019 (9 p.m. EDT October 15, 2019). 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 2019 (6 a.m. EDT October 15, 2019). 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 9th – Zenithal Hourly Rate = 10
  • OriR – Orionid Radiant – Peak 22nd – Zenithal Hourly Rate = 20

Twilight Limits, Nautical and Astronomical

EDT
Traverse
City
Morning twilight Evening twilight Dark night Moon
Date Astro. Nautical Nautical Astro. Start End Illum.
2019-10-01 6h08m 6h42m 20h30m 21h04m 21h28m 6h08m 0.13
2019-10-02 6h09m 6h44m 20h28m 21h02m 22h04m 6h09m 0.22
2019-10-03 6h11m 6h45m 20h26m 21h00m 22h46m 6h11m 0.32
2019-10-04 6h12m 6h46m 20h24m 20h58m 23h33m 6h12m 0.43
2019-10-05 6h13m 6h47m 20h22m 20h56m 6h13m 0.53
2019-10-06 6h15m 6h49m 20h20m 20h54m 0h25m 6h15m 0.63
2019-10-07 6h16m 6h50m 20h19m 20h53m 1h22m 6h16m 0.73
2019-10-08 6h17m 6h51m 20h17m 20h51m 2h21m 6h17m 0.81
2019-10-09 6h18m 6h52m 20h15m 20h49m 3h21m 6h18m 0.88
2019-10-10 6h20m 6h53m 20h13m 20h47m 4h22m 6h20m 0.93
2019-10-11 6h21m 6h55m 20h12m 20h45m 5h23m 6h21m 0.93
2019-10-12 6h22m 6h56m 20h10m 20h44m 0.97
2019-10-13 6h23m 6h57m 20h08m 20h42m 1
2019-10-14 6h25m 6h58m 20h06m 20h40m 1
2019-10-15 6h26m 7h00m 20h05m 20h38m 0.98
2019-10-16 6h27m 7h01m 20h03m 20h37m 20h37m 20h44m 0.94
2019-10-17 6h28m 7h02m 20h01m 20h35m 20h35m 21h18m 0.89
2019-10-18 6h29m 7h03m 20h00m 20h34m 20h34m 21h59m 0.81
2019-10-19 6h31m 7h04m 19h58m 20h32m 20h32m 22h49m 0.72
2019-10-20 6h32m 7h06m 19h57m 20h30m 20h30m 23h48m 0.62
2019-10-21 6h33m 7h07m 19h55m 20h29m 20h29m 0.5
2019-10-22 6h34m 7h08m 19h54m 20h27m 20h27m 0h55m 0.39
2019-10-23 6h36m 7h09m 19h52m 20h26m 20h26m 2h08m 0.28
2019-10-24 6h37m 7h11m 19h51m 20h24m 20h24m 3h24m 0.17
2019-10-25 6h38m 7h12m 19h49m 20h23m 20h23m 4h42m 0.09
2019-10-26 6h39m 7h13m 19h48m 20h21m 20h21m 6h00m 0.03
2019-10-27 6h40m 7h14m 19h46m 20h20m 20h20m 6h40m 0
2019-10-28 6h42m 7h15m 19h45m 20h19m 20h19m 6h42m 0
2019-10-29 6h43m 7h17m 19h43m 20h17m 20h17m 6h43m 0.04
2019-10-30 6h44m 7h18m 19h42m 20h16m 20h36m 6h44m 0.09
2019-10-31 6h45m 7h19m 19h41m 20h15m 21h22m 6h45m 0.17

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
Oct  1 Tu          Venus: 13.1° E
     3 Th  4:23 pm Moon-Jupiter: 2° S
     5 Sa 12:01 pm Moon South Dec.: 22.8° S
     5 Sa 12:47 pm First Quarter
     5 Sa  2:49 pm Moon Descending Node
     5 Sa  4:48 pm Moon-Saturn: 0.3° N
    10 Th  2:29 pm Moon Apogee: 405900 km
    13 Su  5:08 pm Full Moon
    19 Sa 11:59 pm Mercury Elongation: 24.6° E
    20 Su  3:28 am Moon Ascending Node
    20 Su  4:07 am Moon North Dec.: 22.9° N
    21 Mo  8:39 am Last Quarter
    21 Mo  7:12 pm Orionid Shower: ZHR = 20
    22 Tu 12:41 am Moon-Beehive: 0.7° S
    26 Sa  6:41 am Moon Perigee: 361300 km
    27 Su 10:38 pm New Moon
    28 Mo  3:17 am Uranus Opposition
    29 Tu  8:33 am Moon-Venus: 4° S
    30 We 11:22 pm Mercury-Venus: 2.5° N
    31 Th  9:22 am Moon-Jupiter: 1.4° S
Nov  1 Fr          Venus: 20.8° E

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
     October, 2019    Local time zone: EDT
     +-----------------------------------------------------------------------+
     | DATE |  SUN     SUN  DAYLIGHT|   TWILIGHT*    |MOON  RISE OR    ILLUM |
     |      |  RISE    SET    HOURS |  END    START  |PHASE SET** TIME FRACTN|
     +=======================================================================+
     |Tue  1| 07:40a  07:23p  11:43 | 08:26p  06:37a |      Set  09:28p   14%|
     |Wed  2| 07:41a  07:21p  11:40 | 08:24p  06:38a |      Set  10:04p   23%|
     |Thu  3| 07:42a  07:20p  11:37 | 08:22p  06:39a |      Set  10:46p   33%|
     |Fri  4| 07:44a  07:18p  11:34 | 08:21p  06:41a |      Set  11:33p   43%|
     |Sat  5| 07:45a  07:16p  11:30 | 08:19p  06:42a |F Qtr Set  12:25a   53%|
     +------+-----------------------+----------------+-----------------------+
     |Sun  6| 07:46a  07:14p  11:27 | 08:17p  06:43a |      Set  01:21a   63%|
     |Mon  7| 07:47a  07:12p  11:24 | 08:15p  06:44a |      Set  02:21a   72%|
     |Tue  8| 07:49a  07:10p  11:21 | 08:13p  06:46a |      Set  03:21a   80%|
     |Wed  9| 07:50a  07:09p  11:18 | 08:12p  06:47a |      Set  04:22a   87%|
     |Thu 10| 07:51a  07:07p  11:15 | 08:10p  06:48a |      Set  05:23a   92%|
     |Fri 11| 07:52a  07:05p  11:12 | 08:08p  06:49a |      Set  06:24a   97%|
     |Sat 12| 07:54a  07:03p  11:09 | 08:06p  06:50a |      Set  07:25a   99%|
     +------+-----------------------+----------------+-----------------------+
     |Sun 13| 07:55a  07:02p  11:06 | 08:05p  06:52a |Full  Rise 07:25p  100%|
     |Mon 14| 07:56a  07:00p  11:03 | 08:03p  06:53a |      Rise 07:49p   99%|
     |Tue 15| 07:57a  06:58p  11:00 | 08:01p  06:54a |      Rise 08:14p   96%|
     |Wed 16| 07:59a  06:56p  10:57 | 08:00p  06:55a |      Rise 08:44p   91%|
     |Thu 17| 08:00a  06:55p  10:54 | 07:58p  06:57a |      Rise 09:18p   84%|
     |Fri 18| 08:01a  06:53p  10:51 | 07:56p  06:58a |      Rise 09:59p   76%|
     |Sat 19| 08:03a  06:51p  10:48 | 07:55p  06:59a |      Rise 10:49p   66%|
     +------+-----------------------+----------------+-----------------------+
     |Sun 20| 08:04a  06:50p  10:45 | 07:53p  07:00a |      Rise 11:48p   56%|
     |Mon 21| 08:05a  06:48p  10:42 | 07:52p  07:02a |L Qtr Rise 12:55a   45%|
     |Tue 22| 08:07a  06:46p  10:39 | 07:50p  07:03a |      Rise 02:08a   34%|
     |Wed 23| 08:08a  06:45p  10:36 | 07:49p  07:04a |      Rise 03:24a   23%|
     |Thu 24| 08:09a  06:43p  10:33 | 07:47p  07:05a |      Rise 04:41a   14%|
     |Fri 25| 08:11a  06:42p  10:31 | 07:46p  07:06a |      Rise 06:00a    7%|
     |Sat 26| 08:12a  06:40p  10:28 | 07:44p  07:08a |      Rise 07:18a    2%|
     +------+-----------------------+----------------+-----------------------+
     |Sun 27| 08:13a  06:39p  10:25 | 07:43p  07:09a |New   Set  06:51p    0%|
     |Mon 28| 08:15a  06:37p  10:22 | 07:41p  07:10a |      Set  07:22p    1%|
     |Tue 29| 08:16a  06:36p  10:19 | 07:40p  07:11a |      Set  07:57p    5%|
     |Wed 30| 08:17a  06:34p  10:16 | 07:39p  07:13a |      Set  08:36p   11%|
     |Thu 31| 08:19a  06:33p  10:14 | 07:37p  07:14a |      Set  09:22p   18%|
     +-----------------------------------------------------------------------+
     * Nautical Twilight
     ** Moonrise or moonset, whichever occurs between sunrise and sunset

Generated using my LookingUp for DOS program.