- vernal conjunctivitis,
- vernal grass,
- vernal pool,
Origin of vernal equinox
Origin of equinox
Word Origin for equinox
- astronomy the point, lying in the constellation Pisces, at which the sun's ecliptic intersects the celestial equator
- the time at which this occurs as the sun travels south to north (March 21)
late 14c., from Old French equinoce (12c.) or directly from Medieval Latin equinoxium "equality of night (and day)," from Latin aequinoctium "the equinoxes," from aequus "equal" (see equal (adj.)) + nox (genitive noctis) "night" (see night). The Old English translation was efnniht. Related: Equinoctial.
The twice yearly times when the lengths of day and night are equal. At equinox, the sun is directly over the Earth's equator. The vernal equinox occurs about March 22 and the autumnal equinox about September 21.