"Astronomers mark the change of seasons as the moment when the sun crosses over the celestial equator from the northern hemisphere of the sky to the southern hemisphere. This year the exact minute of the autumnal equinox is 3:21 p.m. Eastern Daylight Time on Sept. 22. At that moment, fall begins in the Northern Hemisphere and spring in the Southern. On the day of the equinox, an observer located on Earth’s equator will see the sun pass directly overhead at local noon. It also marks the beginning of six months of daylight at the South Pole and six months of nighttime at the North Pole."

View A Time-Lapse Video of the Equinox Here: http://videos.umass.edu/invideo/detail/videos/umass-in-video/video/55894...