Home > Ephemeris Program, Equinox > 09/22/2016 – Ephemeris – Autumn will begin this morning

09/22/2016 – Ephemeris – Autumn will begin this morning

September 22, 2016

Ephemeris for Thursday, September 22nd.  The Sun will rise at 7:30.  It’ll be up for 12 hours and 8 minutes, setting at 7:39.  The Moon, 1 day before last quarter, will rise at 12:06 tomorrow morning.

Fall is about to a, well… fall upon us and in a few weeks so will the leaves.  At 10:21 (14:21 UT) this morning the Sun will cross the celestial equator heading south.  The celestial equator is an imaginary line in the sky above the earth’s equator.  At that point the sun will theoretically set at the north pole and rise at the south pole.  The day is called the autumnal equinox and the daylight hours today is 12 hours and 8 minutes instead of 12 hours exactly.  That’s due to our atmosphere and our definition of sunrise and sunset.  The reason for the cooler weather now and the cold weather this winter is that the length of daylight is shortening, and the Sun rides lower in the sky, spreading its heat over a larger area, thus diluting its intensity.

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

Addendum

The Earth near the autumnal equinox

The Earth as seen a couple of days ago from NOAA,s DSCOVR satellite located near the Sun-Earth L-1 point 1 million miles sunward from the Earth. Credit NOAA/NASA.

Sun's path through the sky on the equinox

The Sun’s path through the sky on the equinox day from Traverse City, MI. Created using my LookingUp program.

 

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