The date (near March 21 in the northern hemisphere) when night and day are nearly the same length and Sun crosses the celestial equator (i.e., declination 0) moving northward… The vernal equinox marks the first day of the season of spring, quoting Science World.
From the US Naval Observatory, the Vernal Equinox is Saturday, March 20, 2010 at 1:32PM EDT or 10:32AM PDT here in Yelm.
HAPPY SPRING!
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