Seasons for the Northern Hemisphere, 2017
- Vernal Equinox: Mar. 20, 6:29 A.M. EDT (10:29 UT*), Sun enters sign of Aries; spring begins.
- Summer Solstice: June 21, 12:24 A.M. EDT (04:34 UT*), Sun enters sign of Cancer; summer begins.
- Autumnal Equinox: Sept. 22, 4:02 P.M. EDT (20:02 UT*), Sun enters sign of Libra; fall begins.
- Winter Solstice: Dec. 21, 11:28 A.M. EDT (16:28 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.