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Equinoxes and Solstices 

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

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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