Seasons for the Northern Hemisphere, 2011
- Vernal Equinox: Mar. 20, 7:21 P.M. EDT (23:21 UT*), Sun enters sign of Aries; spring begins.
- Summer Solstice: June 21, 1:16 P.M. EDT (17:16 UT*), Sun enters sign of Cancer; summer begins.
- Autumnal Equinox: Sept. 23, 5:05 A.M. EDT (09:05 UT*), Sun enters sign of Libra; fall begins.
- Winter Solstice: Dec. 22, 12:30 A.M. EDT (05:30 UT*), Sun enters sign of Capricorn; winter begins.
*Universal time (UT), also known as Greenwich mean time (GMT). See Astronomy for a conversion table of universal time.