Summer has ended and the leaves are changing colors amid cooler temps, but why is the first day of fall on September 23rd?
The first day of fall is on the autumnal equinox. This is when both day and night are about 12 hours long (with the actual time of equal day and night, in the Northern Hemisphere, occurring a few days after the autumnal equinox). According to Almanac.com, “The Sun crosses the celestial equator going southward; it rises exactly due east and sets exactly due west.”

This day occurs on September 22 or 23rd each year.
So bundle up, winter is rapidly approaching!
