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09/01/2014 – Ephemeris – Previewing the month of September

September 1, 2014

Ephemeris for Labor Day, Monday, September 1st.  The sun will rise at 7:04.  It’ll be up for 13 hours and 14 minutes, setting at 8:19.   The moon, 1 day before first quarter, will set at 12:02 tomorrow morning.

Let’s look at the skies for the month of September. The sun will moving at its greatest speed in its retreat to the south. Daylight hours in the Interlochen/Traverse City area and will drop from 13 hours and 14 minutes today to 11 hours 45 minutes on the 30th. The altitude of the sun above the southern horizon at local noon will be 54 degrees today, and will descend to 42 degrees on the 30th. The season of summer is getting short, so enjoy it while you can. Summer ends and autumn begins at 10:30 p.m. on September 22nd.  Saturn is retreating toward the sun now.  Mars is pushing on eastward.  On the 27th Mars will be north of the star Antares.  It will be a good time to compare their colors.

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


September Star Chart

September star chart for 10 p.m. on September 15, 2014. Created by my LookingUp program.

The Moon is not plotted.  The planets are plotted for the 15th.  Mars will move eastward through the month and will approach Saturn.

Astronomical twilight ends at 10:05 p.m. on September 1st, decreasing to 9:01 on the 30th.

Add a half hour to every week before the 15th and subtract and hour for every week after the 15th.

For a list of constellation names to go with the abbreviations click here.

Also shown is the Summer Triangle in red. Clockwise from the top star is Deneb in Cygnus, Vega in  Lyra and Altair in Aquila.

The green pointers from the Big Dipper are:

  • Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
  • The arc of the dipper’s handle points to Arcturus.
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