Illumination of the Earth by the Sun on the da...

First Day Of Spring

Vernal Equinox 2010, also known as the Spring Equinox or March Equinox, occurs on Saturday, March 20, 2010.

The Vernal Equinox (equinox meaning "equal night") officially marks the beginning of spring in the northern hemisphere and fall in the southern hemisphere. The official time for Vernal Equinox 2010 is 1:32 p.m. EST on March 20.

An equinox occurs twice a year -- in March and September -- when the sun shines directly on the equator and the length of day and night are nearly equal in all parts of the world.

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