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back to my Astronomy JavaScript page

Equinoxes and Solstices   

Year:

Spring:

Summer:

Autumn:

Winter:


Perihelion:

Aphelion:

From    to  

 

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 ?

The Seasons (National Maritime Museum)

How does the Sun appear to move across our sky?

Seasons of the Year

Earth's Seasons, Equinoxes, Solstices, Perihelion, and Aphelion 1992-2020

Jahreszeiten

The Equinoxes and Solstices

Last Modified: 2012, May 06

© 2001-2012 J. Giesen