autumnal l equinox秋分
Vernal Equinox Autumnal Equinox春分秋分
the Autumnal Equinox秋分
autumnal equinox tide秋分潮
autumnal equinox point秋分点
day of autumnal equinox秋分
N（名词） 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) 秋分点