They're widely and erroneously known as the equinoxes, but they're not.
The equinoxes are points on the map of the sky, not points in time.
March 21 and September 21 are the dates near which the sun reaches
and passes the equinoxes.
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day light savings
Days between 14 March and 21 April 2010 are 38.
From September 21 until March 21, the shortest shadow points north from the equator. From March 21 until September 21, the shortest shadow points south from the equator.
21
21 of them.