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Welcome autumnal equinox!

September 23 marks the autumnal equinox, which means the official start of astronomical fall (remember, climatological fall started on September 1).  The official time of the equinox is 4:20 AM Eastern Daylight Time.

EarthSky had an article this week discussing why day and night are not equal on the day of the equinox which you might find interesting.

Source: Steve Jurvetson, Commons Wikimedia

Source: Steve Jurvetson, Commons Wikimedia