The first day of fall in 2009 is September 22. Also known as the Autumnal Equinox or September Equinox, the date marks the official end of summer and the beginning of fall.
At 21:18 UTC on September 22, 2009, the Earth's axis will be pointing directly at the sun. The Autumnal Equinox is also one of two days a year when night and day is nearly identical in length.
