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physical phenomena > event > celestial event > periodic celestial event > equinox > autumnal equinox
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autumnal equinox comparison table
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equinox periodic celestial eventEither of the two points on the celestial sphere at which the ecliptic intersects the celestial equator; also the time at which the Sun passes through either of these intersection points; i.e., when the apparent longitude (see apparent place; celestial longitude) of the Sun is 0° or 180°. (See catalog equinox; dynamical equinox for precise usage.)
autumnal equinoxequinox See equinox

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