Autumnal-equinox meaning

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One of two points at which the ecliptic intersects the celestial equator. At the autumnal equinox, the sun is moving along the ecliptic in a southeasterly direction.
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The moment when the sun appears to cross the celestial equator, heading southward.
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The point where the ecliptic intersects the celestial equator at that time.
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The moment at which the sun passes through this point on or about September 23, marking the beginning of autumn in the Northern Hemisphere and spring in the Southern Hemisphere.
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