ALL meanings of autumnal equinox
autumnal equinox
A a - noun autumnal equinox the time at which the sun crosses the plane of the equator away from the relevant hemisphere, making day and night of equal length. It occurs about Sept 23 in the N hemisphere (March 21 in the S hemisphere) 3
- noun autumnal equinox the point, lying in the constellation Virgo, at which the sun's ecliptic intersects the celestial equator 3
- noun autumnal equinox the time at which this occurs as the sun travels north to south (23 September) 3
- noun autumnal equinox the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox or spring equinox) and September 22 (autumnal equinox) 1
- noun autumnal equinox either of the equinoctial points. 1
- noun autumnal equinox first day of the fall season 1
- noun autumnal equinox the moment when the sun appears to cross the celestial equator, heading southward. 0
- noun autumnal equinox the point where the ecliptic intersects the celestial equator at that time. 0