First Day of Fall 2013: The Autumnal Equinox

When does fall begin? The equinox brings autumn on September 22, 2013 at 4:44 P.M EDT.  The word equinox comes from the Latin words for "equal night." The fall and spring equinoxes are the only days of the year in which the Sun crosses the celestial equator. From here on out, the temperatures begin to drop and the days start to get shorter than the nights