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.
Celebrating the Vernal Equinox is a special tradition in Mexico at the site of Ancient Mayan ruins in Chichen Itza. Thousands of tourists and locals alike flock to the scene to participate.
The sun is always the focal point of Vernal Equinox festivities. Take a look at last year's celebration in Mexico and vote on your favorite pictures.