Equinoxes and Solstices Calculator For Any YearYear Range: 1600 to 2200 Calendar Year(1600  to  2200) Time Zone OffsetNeg | Pos  =  W | E UT Download this PHP 7 Program: 4.1 meg - Equinoxes and Solstices Calculator ========================================================================== EQUINOXES AND SOLSTICES DATES AND TIMES For the Year 2022 =========================================================================== LT (Local Time) in Time Zone UT-05:00 Julian_Date_LT Calendar_Date Time_LT EVENT ---------------- --------------- -------- ----------------- 2459658.93985802 2022 Mar 20 Sun 10:33 AM March Equinox 2459751.67628112 2022 Jun 21 Tue 04:14 AM June Solstice 2459845.33640881 2022 Sep 22 Thu 08:04 PM September Equinox 2459935.20015169 2022 Dec 21 Wed 04:48 PM December Solstice =========================================================================== UT (Universal Time) Julian_Date_UT Calendar_Date Time_UT EVENT ---------------- --------------- -------- ----------------- 2459659.14819135 2022 Mar 20 Sun 03:33 PM March Equinox 2459751.88461445 2022 Jun 21 Tue 09:14 AM June Solstice 2459845.54474215 2022 Sep 23 Fri 01:04 AM September Equinox 2459935.40848502 2022 Dec 21 Wed 09:48 PM December Solstice =========================================================================== TT (Terrestrial Dynamical Time) TT − UT Julian_Date_TT Calendar_Date Time_TT Delta_T EVENT ---------------- --------------- -------- --------- ----------------- 2459659.14899211 2022 Mar 20 Sun 15:34:33 +00:01:09 March Equinox 2459751.88541520 2022 Jun 21 Tue 09:15:00 +00:01:09 June Solstice 2459845.54554287 2022 Sep 23 Fri 01:05:35 +00:01:09 September Equinox 2459935.40928576 2022 Dec 21 Wed 21:49:22 +00:01:09 December Solstice =========================================================================== =========================================================================== SOME GENERAL INFORMATION All computations are based on the NASA/JPL DE405 ephemeris model. The greatest uncertainty is in the future long-term 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. =========================================================== PHP 7 astronomy program by Jay TannerRevised: Thursday, January 01, 1970 at 12:00 AM UTC