autumnal equinox

autumnal-equinox的词性：
n.（名词）

1. The point at which the ecliptic intersects the celestial equator, the sun having a southerly motion.
秋分：指黄道与天赤道相交的一点，自此太阳向南运动

2. The moment at which the sun passes through the autumnal equinox, about September 23, marking the beginning of autumn.
秋分时刻：指太阳通过秋分点的时刻，大约为9月23日，标志着秋季的开始