Autumnal Equinox

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Autumnal Equinox

1. That point of intersection on the celestial sphere of the ecliptic and the celestial equator occupied by the sun as it changes from north to south declination, on or about September 23. Also called September equinox, first point of Libra .

2. That instant the sun reaches the point of zero declination when crossing the celestial equator from north to south.

References

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