Dates and Times of the Equinoxes and Solstices (Beginnings of the Seasons)
This program computes the local dates and times, in any given time zone, of the beginnings
of the northern/southern seasons for any given Gregorian year from 1600 to 2400
Local Time = UT
Dates and Times of Northern/Southern Equinoxes and Solstices For year 2017, where Local Time = UT-05:00 (West of Greenwich) ================================================================= Local Standard Estimated Hemisphere DATE and TIME Delta T North / South Year Mmm dd hh:mm:ss DoW ±hh:mm:ss ====================== ==== === == ======== === ========= Spring/Autumn Equinox = 2017 Mar 20 05:29:34 Mon +00:01:10 Summer/Winter Solstice = 2017 Jun 20 23:25:17 Tue +00:01:10 Autumn/Spring Equinox = 2017 Sep 22 15:03:35 Fri +00:01:10 Winter/Summer Solstice = 2017 Dec 21 11:29:05 Thu +00:01:11 ================================================================= Times are computed on TT scale. Subtract the optional Delta T estimate to obtain the local zone standard time. For daylight saving/summer time, add 1 hour to the standard time.
Jay Tanner - 2017