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. </dd>
2. Tat instant the sun reaches the point of zero declination when crossing the celestial equator from south to north. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use