Vernal Equinox
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Vernal Equinox
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1. That point of intersection of the ecliptic and
the celestial
equator, occupied by the sun as it changes from south to north declination,
on or about March 21. Also called March equinox, first point of Aries.
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2. Tat instant the sun reaches the point of zero declination when crossing
the celestial equator from south to north.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use