Equinox

(redirected from First Point of Aries)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to First Point of Aries: right ascension, sidereal time

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.