06/01/2021 – Ephemeris – Previewing June Skies

This is Ephemeris for Tuesday, 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, 1 day before last quarter, will rise at 2:49 tomorrow morning.

This is the 46th anniversary of this program as we start our 47th orbit of the Sun. Let’s take a look at June skies. There will be a lot of Sunshine this month. The daylight hours will increase a bit from 15 hours and 21 minutes today to 15 hours and 34 minutes on the 21st, 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 (1:44 pm in Interlochen) on the solstice, June 20th will be 68 and three-quarters degrees in Interlochen. Summer will start at 11:32 pm that night.

The big event this month will be a sunrise partial eclipse on the 10th. I’ll have more information next week.

The astronomical 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 2021 (11 p.m. EDT June 15, 2021). 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 Interlochen/Traverse City is located approximately 45 minutes behind our time meridian, West 75° longitude. (An hour 45 minutes behind our daylight saving time meridian during EDT). To duplicate the star positions on a planisphere you may have to set it to 1 hour 45 minutes earlier than the current time.
Note the chart times of 11 p.m. and 5 a.m. are for the 15th. For each week before the 15th, add ½ hour (28 minutes if you’re picky). For each week after the 15th, subtract ½ hour, or 28 minutes. The planet positions are updated each Wednesday on this blog. For planet positions on dates other than the 15th, check the Wednesday planet posts on this blog for weekly positions.

June Morning Star Chart

Star Chart for June mornings 2021 (4 am EDT June 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.
• 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,

Twilight Limits, Nautical and Astronomical

			EDT
	Morning	Twilight	Evening	Twilight	Dark	Night	Moon
Date	Astro.	Nautical	Nautical	Astro.	Start	End	Illum.
2021-06-01	3h42m	4h42m	22h47m	23h46m	23h46m	2h23m	0.51
2021-06-02	3h41m	4h41m	22h48m	23h48m	23h48m	2h49m	0.41
2021-06-03	3h40m	4h40m	22h49m	23h49m	23h49m	3h11m	0.32
2021-06-04	3h39m	4h39m	22h50m	23h51m	23h51m	3h30m	0.23
2021-06-05	3h38m	4h39m	22h51m	23h52m	23h52m	3h38m	0.16
2021-06-06	3h37m	4h38m	22h52m	23h54m	23h54m	3h37m	0.09
2021-06-07	3h36m	4h38m	22h53m	23h55m	23h55m	3h36m	0.05
2021-06-08	3h35m	4h37m	22h54m	23h56m	23h56m	3h35m	0.01
2021-06-09	3h34m	4h37m	22h55m	23h57m	23h57m	3h34m	0
2021-06-10	3h33m	4h36m	22h55m	23h58m	23h58m	3h33m	0.01
2021-06-11	3h33m	4h36m	22h56m	23h59m	23h59m	3h33m	0.03
2021-06-12	3h32m	4h36m	22h57m	0h00m	0h00m	3h32m	0.07
2021-06-13	3h32m	4h35m	22h58m	0h01m	0h01m	3h32m	0.13
2021-06-14	3h31m	4h35m	22h58m	0h02m	0h26m	3h31m	0.21
2021-06-15	3h31m	4h35m	22h59m	0h03m	1h01m	3h31m	0.3
2021-06-16	3h31m	4h35m	22h59m	0h03m	1h30m	3h31m	0.4
2021-06-17	3h31m	4h35m	23h00m	0h04m	1h55m	3h31m	0.5
2021-06-18	3h31m	4h35m	23h00m	0h05m	2h18m	3h31m	0.62
2021-06-19	3h31m	4h35m	23h00m	0h05m	2h41m	3h31m	0.72
2021-06-20	3h31m	4h35m	23h01m	0h05m	3h05m	3h31m	0.82
2021-06-21	3h31m	4h36m	23h01m	0h05m	3h31m	3h31m	0.91
2021-06-22	3h31m	4h36m	23h01m	0h06m	–	–	0.96
2021-06-23	3h32m	4h36m	23h01m	0h06m	–	–	1
2021-06-24	3h32m	4h37m	23h01m	0h06m	–	–	1
2021-06-25	3h33m	4h37m	23h01m	0h05m	–	–	0.97
2021-06-26	3h33m	4h38m	23h01m	0h05m	–	–	0.92
2021-06-27	3h34m	4h38m	23h01m	0h05m	–	–	0.85
2021-06-28	3h35m	4h39m	23h01m	0h04m	0h04m	0h22m	0.76
2021-06-29	3h36m	4h39m	23h00m	0h04m	0h04m	0h50m	0.67
2021-06-30	3h37m	4h40m	23h00m	0h03m	0h03m	1h14m	0.57

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

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

NASA Calendar of Planetary Events

Jun  1  Tu            Venus: 17.5° E
     1  Tu   4:57 am  Moon-Jupiter: 4.9° N
     2  We   3:24 am  Last Quarter
     7  Mo  10:27 pm  Moon Apogee: 406200 km
     9  We  12:42 pm  Moon Ascending Node
    10  Th   6:43 am  Annular Solar Eclipse*
    10  Th   6:53 am  New Moon
    10  Th   9:06 pm  Mercury Inferior Conj.
    12  Sa  12:11 am  Moon North Dec.: 25.6° N
    12  Sa   2:44 am  Moon-Venus: 1.6° S
    13  Su   3:52 pm  Moon-Mars: 3° S
    14  Mo   2:47 am  Moon-Beehive: 3.1° S
    17  Th  11:54 pm  First Quarter
    20  Su  11:32 pm  Summer Solstice
    21  Mo  11:57 am  Venus-Pollux: 5.2° S
    22  Tu   4:54 pm  Mercury-Aldebaran: 6.4° N
    23  We   1:21 am  Mars-Beehive: 0.3° S
    23  We   2:07 am  Moon Descending Node
    23  We   5:58 am  Moon Perigee: 360000 km
    24  Th   2:40 pm  Full Moon
    25  Fr   1:49 am  Moon South Dec.: 25.6° S
    27  Su   5:30 am  Moon-Saturn: 4.1° N
    28  Mo   2:38 pm  Moon-Jupiter: 4.6° N

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

Sun and Moon Rising and Setting Events

LU                  Ephemeris of Sky Events for Interlochen/TC
June, 2021    Local time zone: EDT
+-----------------------------------------------------------------------+
| DATE |  SUN     SUN  DAYLIGHT|   TWILIGHT*    |MOON  RISE OR    ILLUM |
|      |  RISE    SET    HOURS |  END    START  |PHASE SET** TIME FRACTN|
+=======================================================================+
|Tue  1| 06:00a  09:21p  15:21 | 10:45p  04:37a |      Rise 02:49a   53%|
|Wed  2| 05:59a  09:22p  15:22 | 10:46p  04:36a |L Qtr Rise 03:10a   43%|
|Thu  3| 05:59a  09:23p  15:23 | 10:47p  04:35a |      Rise 03:30a   33%|
|Fri  4| 05:58a  09:23p  15:25 | 10:48p  04:34a |      Rise 03:49a   25%|
|Sat  5| 05:58a  09:24p  15:26 | 10:49p  04:34a |      Rise 04:09a   17%|
+------+-----------------------+----------------+-----------------------+
|Sun  6| 05:58a  09:25p  15:27 | 10:50p  04:33a |      Rise 04:30a   10%|
|Mon  7| 05:57a  09:26p  15:28 | 10:50p  04:33a |      Rise 04:54a    5%|
|Tue  8| 05:57a  09:26p  15:29 | 10:51p  04:32a |      Rise 05:22a    2%|
|Wed  9| 05:57a  09:27p  15:30 | 10:52p  04:32a |      Rise 05:57a    0%|
|Thu 10| 05:57a  09:27p  15:30 | 10:53p  04:31a |New   Set  10:01p    0%|
|Fri 11| 05:56a  09:28p  15:31 | 10:54p  04:31a |      Set  10:56p    2%|
|Sat 12| 05:56a  09:28p  15:32 | 10:54p  04:31a |      Set  11:45p    6%|
+------+-----------------------+----------------+-----------------------+
|Sun 13| 05:56a  09:29p  15:32 | 10:55p  04:30a |      Set  12:26a   12%|
|Mon 14| 05:56a  09:29p  15:33 | 10:55p  04:30a |      Set  01:00a   19%|
|Tue 15| 05:56a  09:30p  15:33 | 10:56p  04:30a |      Set  01:29a   28%|
|Wed 16| 05:56a  09:30p  15:34 | 10:56p  04:30a |      Set  01:55a   37%|
|Thu 17| 05:56a  09:31p  15:34 | 10:57p  04:30a |F Qtr Set  02:18a   48%|
|Fri 18| 05:56a  09:31p  15:34 | 10:57p  04:30a |      Set  02:41a   59%|
|Sat 19| 05:56a  09:31p  15:34 | 10:58p  04:30a |      Set  03:04a   70%|
+------+-----------------------+----------------+-----------------------+
|Sun 20| 05:57a  09:31p  15:34 | 10:58p  04:30a |      Set  03:31a   80%|
|Mon 21| 05:57a  09:32p  15:34 | 10:58p  04:30a |      Set  04:02a   89%|
|Tue 22| 05:57a  09:32p  15:34 | 10:58p  04:31a |      Set  04:41a   95%|
|Wed 23| 05:57a  09:32p  15:34 | 10:58p  04:31a |      Set  05:30a   99%|
|Thu 24| 05:58a  09:32p  15:34 | 10:58p  04:31a |Full  Rise 09:59p  100%|
|Fri 25| 05:58a  09:32p  15:34 | 10:58p  04:32a |      Rise 10:58p   98%|
|Sat 26| 05:58a  09:32p  15:33 | 10:58p  04:32a |      Rise 11:45p   93%|
+------+-----------------------+----------------+-----------------------+
|Sun 27| 05:59a  09:32p  15:33 | 10:58p  04:33a |      Rise 12:22a   86%|
|Mon 28| 05:59a  09:32p  15:32 | 10:58p  04:33a |      Rise 12:50a   78%|
|Tue 29| 06:00a  09:32p  15:32 | 10:57p  04:34a |      Rise 01:14a   69%|
|Wed 30| 06:00a  09:32p  15:31 | 10:57p  04:35a |      Rise 01:35a   59%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunrise and sunset

Generated using my LookingUp for DOS program.