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 2025 =========================================================================== LT (Local Time) in Time Zone UT-05:00 Julian_Date_LT Calendar_Date Time_LT EVENT ---------------- --------------- -------- ----------------- 2460754.66810726 2025 Mar 20 Thu 04:02 AM March Equinox 2460847.40427820 2025 Jun 20 Fri 09:42 PM June Solstice 2460941.05490154 2025 Sep 22 Mon 01:19 PM September Equinox 2461030.91873891 2025 Dec 21 Sun 10:03 AM December Solstice =========================================================================== UT (Universal Time) Julian_Date_UT Calendar_Date Time_UT EVENT ---------------- --------------- -------- ----------------- 2460754.87644059 2025 Mar 20 Thu 09:02 AM March Equinox 2460847.61261153 2025 Jun 21 Sat 02:42 AM June Solstice 2460941.26323487 2025 Sep 22 Mon 06:19 PM September Equinox 2461031.12707224 2025 Dec 21 Sun 03:03 PM December Solstice =========================================================================== TT (Terrestrial Dynamical Time) TT − UT Julian_Date_TT Calendar_Date Time_TT Delta_T EVENT ---------------- --------------- -------- --------- ----------------- 2460754.87730865 2025 Mar 20 Thu 09:03:19 +00:01:15 March Equinox 2460847.61347959 2025 Jun 21 Sat 02:43:25 +00:01:15 June Solstice 2460941.26410293 2025 Sep 22 Mon 18:20:18 +00:01:15 September Equinox 2461031.12794030 2025 Dec 21 Sun 15:04:14 +00:01:15 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