Equinox

(redirected from Invernal equinox)
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

EQUINOX. The name given to two periods of the year when the days and nights are equal; that is, when the space of time between the rising and setting of the sun is one half of a natural day. Dig. 43, 13, 1, 8. Vide Day.