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physical phenomena > event > celestial event > periodic celestial event > equinox > autumnal equinox |
autumnal equinox comparison table |
Subject | is an instance of | is a kind of | has definition |
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equinox | periodic celestial event | Either 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 equinox | equinox | See equinox |
Next equinox: vernal equinox Up: equinox