Seasons for the Northern Hemisphere, 2015
- Vernal Equinox: Mar. 20, 6:45 P.M. EDT (22:45 UT*), Sun enters sign of Aries; spring begins.
- Summer Solstice: June 21, 12:38 P.M. EDT (16:38 UT*), Sun enters sign of Cancer; summer begins.
- Autumnal Equinox: Sept. 23, 4:20 A.M. EDT (08:20 UT*), Sun enters sign of Libra; fall begins.
- Winter Solstice: Dec. 21, 11:48 P.M. EDT (04:48 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.