vernal equinox – Definition, Pronunciation & Pictures

vernal equinox /ˈvɜːmɪfˌɔːm ɐpˈɛndɪks/ n

中文：春分点

Meaning：At the equinoxes, day and night are of equal length; the vernal (spring) equinox is on March 20 or 21 in the Northern hemisphere.

Found in these illustrated scenes（2）

Four seasons Celestial coordinate system