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 2018, 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 = 2018 Mar 20 11:17:10 Tue +00:01:11 Summer/Winter Solstice = 2018 Jun 21 05:08:26 Thu +00:01:11 Autumn/Spring Equinox = 2018 Sep 22 20:54:57 Sat +00:01:11 Winter/Summer Solstice = 2018 Dec 21 17:23:53 Fri +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 - 2018