- the intersection of the ecliptic (apparent path of the sun) with the celestial equator. Vernal Equinox is the intersection that the sun crosses about March 20; autumnal equinox denotes the crossing point about September 23.
Etymology: From Latin, meaning "equivalent" and "night"
- Dutch: dag- en nachtevening , equinox
- French: équinoxe
- German: í„quinoktium , Tagundnachtgleiche
- Italian: equinozio
- Spanish: equinoccio
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