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Equinoxes and Solstices 

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The algorithm used in my JavaScript is from the book of Meeus. It is valid for the years 1000 to 3000, and for several centuries after 3000 with errors still quite small. Spring equinox: is the beginning of spring (vernal equinox). It occurs on March 19, 20 or 21 in the Northern Hemisphere. For the years from 1583 to 3082 there are 100 Spring equinoxes on March 19, 1032 on March 20, and 368 on on March 21. Summer solstice: is the beginning of summer. It occurs on June 21 or 22 in the Northern Hemisphere. Autumnal equinox: is the beginning of autumn. It occurs on Sept. 22 or 23 in the Northern Hemisphere. Winter solstice: is the beginning of winter. It occurs on on Dec. 21 or 22 in the Northern Hemisphere. Visit my Seasons Applet

Date of spring equinox frequencies per century (2000-2099 to 2900-2999):

Total 2000 to 2999:

Mar 19	Mar 20	Mar 21
94	723	183

Total 3000 to 3999:

Mar 19	Mar 20	Mar 21
72	699	229

Total 4000 to 4999:

Mar 19	Mar 20	Mar 21
86	720	194

Web Links

What Causes the Seasons ? Understanding Equinox and Solstice How does the Sun appear to move across our sky? Seasons Of The Year - 1999 Through 2005 Seasons of the Year Earth's Seasons, Equinoxes, Solstices, Perihelion, and Aphelion 1992-2005 Jahreszeiten The Equinoxes and Solstices

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© Jürgen Giesen