autumnal equinox ( synonym found)
Definition of autumnal equinox:

°the moment when the sun appears to cross the celestial equator, heading southward.
°the point where the ecliptic intersects the celestial equator at that time.
Definition of autumnal equinox:

°the moment when the sun appears to cross the celestial equator, heading southward.
°the point where the ecliptic intersects the celestial equator at that time.
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