Ephemeris Star Charts – September 2020

Contents:

Monthly Star Chart s for Northern Michigan (about 45° North)
Twilight ranges for the Grand Traverse Area
Monthly star chart for the Southern Hemisphere

The charts contain the entire dome of the sky as seen from around 45 degrees north latitude and at the dates and times for the locations listed below.

Planet positions are plotted for the 15th of the month. The moon is not shown. To track the planet positions at weekly intervals go to my Ephemeris Blog for my Wednesday posting at bobmoler.wordpress.com.

The charts contain the entire dome of the sky as seen from around 45 degrees north latitude and at the dates and times for the locations listed below.

September Evening Star Chart

Date	Grand Traverse region, Michigan - Eastern Time
1st.	11:00 m. EDT
8th.	10:30 p.m. EDT
15th.	10:00 p.m. EDT
22nd.	9:30 p.m. EDT
29th.	9:00 p.m. EDT

September Morning Star Chart

For early birds I’m including a morning star chart too, which shows the stars we’ll see in the evening 4 months from now.

Date	Grand Traverse region, Michigan - Eastern Time
1st.	7:00 a.m. EDT
8th.	6:30 a.m. EDT
15th.	6:00 a.m. EDT
22nd.	5:30 a.m. EDT
29th.	4:00 a.m. EDT

If you want to convert the above times for your locality in North America click here.

The outer edge of the chart is the horizon with the compass points marked. The chart is oriented as one is looking south. The constellation outlines in magenta are those of the Zodiac. The magenta line is the ecliptic, the path of the sun. The white line that passes through the east and west compass points is the celestial equator, above the earth's equator. The white lines that cross in the north at the north celestial pole are major right ascension lines and are like meridians on the earth.

All constellations shown have the standard three letter abbreviation. The constellation abbreviations, names and bright star names are found here.

Also on the sky dome are helps to locate other stars and constellations from the Big Dipper, and asterisms.

The arrow from the pointer stars of the Big Dipper to Polaris the North Star, near the north celestial pole.
Follow the arc of the handle of the Big Dipper to Arcturus, then
The Summer Triangle is in red.

Twilight, Astronomical and Nautical

			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

The above times calculated by the calendar function of Cartes du Ciel (Sky Charts)

Monthly Evening Star Chart for Observers in the Southern Hemisphere

The chart contains the entire dome of the sky as seen from around 26 degrees south latitude at 2 hours after sunset on the 15th of the month.

Planet positions are also plotted for the 15th of the month. The moon is not shown. The Magellanic Clouds, which are satellite galaxies of the Milky Way. The Large Magellanic Cloud is located in the constellation Dorado (Dor) the Flying Fish. The Small Magellanic Cloud is located in the constellation of Tucana (Tuc) the Toucan.

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Questions or comments, send an email to: bob@bjmoler.org

Updated 09/07/20