Online Reference For Body, Mind & Spirit

Term: Equinox

Equal night. That time, or place, in the ecliptic where the days and nights are of equal length, which happens twice yearly when the Sun enters Aries (Vernal equinox) and Libra (autumnal equinox), from whence these signs derive the term, equinoctial signs.
SOURCE:  A to Z Horoscope Maker and Delineator, by Llewellyn George