How is Spring Equinox calculated?

This event is based on the astronomical moment when the Sun crosses the celestial equator heading northward each year.

When is Spring Equinox 2011?

Name: Spring Equinox
Start: 2011-03-20
End: 2011-03-20
Location: Worldwide

Sunday, 20 March 2011

Spring Equinox marks the astronomical moment when day and night are nearly equal and the Sun crosses the celestial equator northward, signalling the start of spring in the Northern Hemisphere.

Also known as

Vernal Equinox
Northward Equinox

Frequently asked questions

When is Spring Equinox 2011?: Spring Equinox 2011 is on Sunday, 20 March 2011.
What day of the week is Spring Equinox 2011?: It falls on Sunday.
How is Spring Equinox calculated?: This event is based on the astronomical moment when the Sun crosses the celestial equator heading northward each year.