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09/23/2019 – Ephemeris – Fall has fallen upon us

23 Sep 2019, 04:01 UTC
09/23/2019 – Ephemeris – Fall has fallen upon us
(200 words excerpt, click title or image to see full post)

Ephemeris for Monday, September 23rd. Today the Sun will be up for 12 hours and 7 minutes, setting at 7:38, and it will rise tomorrow at 7:32. The Moon, 2 days past last quarter, will rise at 2:01 tomorrow morning.
Fall has, well… fallen upon us and in a few weeks so will the leaves. At 3:49 (7:49 UT) this morning the Sun crossed overhead at the Earth’s equator heading south. At that same time the Sun theoretically set at the north pole and rose at the south pole. The day is called the autumnal equinox and the daylight hours today is 12 hours and 7 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 for us north of the equator 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.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum
The Sun’s path through the sky on the equinox day from ...

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