Equinox Today Heralds Earth's Changing Seasons: Watch It Online
Sunday, September 22, 2013 - 09:30
in Earth & Climate
The autumn equinox today (Sept. 22) marks the first day of fall in the Northern Hemisphere. The exact time of the equinox is 4:44 p.m. EDT (2044 GMT) when the length of the day and night are roughly equal.