Equinoxes and Solstices Calculator For Any Year Year Range: 1600 to 2200
Calendar Year (1600  to  2200)	Time Zone Offset Neg | Pos  =  W | E UT
========================================================================== EQUINOXES AND SOLSTICES DATES AND TIMES For the Year 2020 =========================================================================== LT (Local Time) in Time Zone UT-05:00 Julian_Date_LT Calendar_Date Time_LT EVENT ---------------- --------------- -------- ----------------- 2458928.45113545 2020 Mar 19 Thu 10:50 PM March Equinox 2459021.19696578 2020 Jun 20 Sat 04:44 PM June Solstice 2459114.85449998 2020 Sep 22 Tue 08:30 AM September Equinox 2459204.70993162 2020 Dec 21 Mon 05:02 AM December Solstice =========================================================================== UT (Universal Time) Julian_Date_UT Calendar_Date Time_UT EVENT ---------------- --------------- -------- ----------------- 2458928.65946879 2020 Mar 20 Fri 03:50 AM March Equinox 2459021.40529912 2020 Jun 20 Sat 09:44 PM June Solstice 2459115.06283332 2020 Sep 22 Tue 01:30 PM September Equinox 2459204.91826496 2020 Dec 21 Mon 10:02 AM December Solstice =========================================================================== TT (Terrestrial Dynamical Time) TT − UT Julian_Date_TT Calendar_Date Time_TT Delta_T EVENT ---------------- --------------- -------- --------- ----------------- 2458928.66030212 2020 Mar 20 Fri 03:50:50 +00:01:12 March Equinox 2459021.40613245 2020 Jun 20 Sat 21:44:50 +00:01:12 June Solstice 2459115.06366665 2020 Sep 22 Tue 13:31:41 +00:01:12 September Equinox 2459204.91909829 2020 Dec 21 Mon 10:03:30 +00:01:12 December Solstice =========================================================================== =========================================================================== SOME GENERAL INFORMATION All computations are based on the NASA/JPL DE405 ephemeris model, the IAU 2000B theory of nutation and the NASA polynomial expressions for remote Delta T estimation. The greatest uncertainty is in the Delta T estimate used to compute the UT and LT (Local Time) of the events. Internally, all core computations are for the TT time scale which is then converted into the corresponding UT and LT. Setting the local time zone offset to ±00:00 equates the local time to UT, which is the same thing. =========================================================================== DEFINITIONS OF THE SEASONS The seasons are being defined geometrically as occurring at 90-degree points in the Earth's orbit. The intervals between them varies, but the angular definitions remain constant. March and September equinoxes = Sun declination 0 degrees June and December solstices = Sun RA at 06 and 18 hours ---------------------- March Equinox Sun on celestial equator crossing from south to north. Beginning of northern spring and southern autumn. On an equinox date, days and nights are closest to equal in length in both hemispheres. This happens twice each year, once in March and again in September, when the sun crosses the celestial equator. ---------------------- June Solstice Sun at RA (Right Ascension) 6 hours (90 degrees). Beginning of northern summer and southern winter. It is the shortest day of the year in the southern hemi- sphere and the longest day of the year in the northern hemisphere. -------------------------- September Equinox Sun on celestial equator crossing from north to south. Beginning of northern autumn and southern spring. On an equinox date, days and nights are closest to equal in length in both hemispheres. This happens twice each year, once in March and again in September, when the sun crosses the celestial equator. -------------------------- December Solstice Sun at RA (Right Ascension) 18 hours (270 degrees). Beginning of northern winter and southern summer. It is the shortest day of the year in the northern hemi- sphere and the longest day of the year in the southern hemisphere. ===========================================================
Program by Jay Tanner v1.2.2 - Revised: Thursday, January 01, 1970 at 12:00 AM UTC