Posted by BC on March 9th, 2010
Vernal Equinox occurs Saturday, 20 March 2010, 17:32 UT. Springtime! (For the Northern Hemisphere and Autumn for the Southern Hemisphere.)
“Equinox” comes from the Latin “equal night”. An equinox occurs when Sun crosses the celestial equator, making the length of time of daylight equal to (or nearly equal to) the length of time of night. Days are longer than nights the farther from the equator you observe daylight on an equinox. It all has to do with sun angles and paths across the sky. I found a good explanation at the Date and Time web site.