Vernal Equinox 2009: What Is It?
The vernal equinox occurs when the sun passes directly over the equator, diving night and day into equal lengths. It is one of two equinox events during the year: The autumnal equinox, or fall equinox, happens in September and marks the start of the fall season for the northern hemisphere.
The first day of spring 2009, then, is the same day as the equinox: this Friday, March 20.
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