名詞 equinox:

1. either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length
2. (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
   同義詞：equinoctial point

e.qui.nox

n.（名詞）
Either of two points on the celestial sphere at which the ecliptic intersects the celestial equator.
二分點(diǎn)：在天球上天赤道與黃道相切的兩點(diǎn)中的任一點(diǎn)
Either of the two times during a year when the sun crosses the celestial equator and when the length of day and night are approximately equal; the vernal equinox or the autumnal equinox.
二分時(shí)刻：一天中太陽通過天赤道的兩個(gè)時(shí)刻中的任一時(shí)刻，此時(shí)晝夜長短幾乎相等；春分或秋分

來源：
Middle English
中古英語
from Old French equinoxe
源自 古法語 equinoxe
from Medieval Latin aequinoxium
源自 中世紀(jì)拉丁語 aequinoxium
from Latin aequinoctium
源自 拉丁語 aequinoctium
aequi- [equi-]
aequi- [表示.相等.的構(gòu)詞成分]
nox noct- [night] * see nek w-t-
nox noct- [夜] *參見 nek w-t-