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09/20/2018 – Autumn will fall on us Saturday night

September 20, 2018 Comments off

Ephemeris for Thursday, September 20th. The Sun will rise at 7:27. It’ll be up for 12 hours and 16 minutes, setting at 7:43. The Moon, half way from first quarter to full, will set at 3:44 tomorrow morning.

Welcome to the last few days of summer. The weather has stayed summery thus far through September. The Sun will reach the autumnal equinox point in the sky at 9:54 Saturday evening. At that moment the Sun will cross the celestial equator, a projection of the Earth’s equator, heading southward. All locations on the Earth except two will experience 12 hours of daylight and 12 hours of night. Well they would if the Earth didn’t have an atmosphere and sunset and sunrise were defined differently. The two locations that don’t experience equal night, which is what equinox means, are the north pole where the Sun will be setting and the south pole where the Sun will be rising. For us in the northern hemisphere daylight hours will be shorter and the Sun will peak lower in the south each day until the December solstice.

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

Sun's path through the sky on the equinox
The Sun’s path through the sky on the equinox day from Traverse City, MI.  Local noon, when the Sun is due south, is 1:35 p.m. EDT.   Created using my LookingUp program.