The autumnal equinox at 3:20 p.m. Wednesday marked the beginning of fall and is the moment when the sun is exactly above the equator, and day and night are of equal length.
It’s officially Fall!!! The Fall/Autumnal Equinox was today at 3:20pm EDT. This marks the time when the day-to-night line, called the terminator, is perfectly vertical from pole to pole and the sun is directly over the equator. #FallEquinox #FirstDayOfFall pic.twitter.com/huvcrZcRqp
— National Weather Service (@NWS) September 22, 2021