March equinox Synonyms

vernal equinox spring equinox intersection of the ecliptic and celestial equator marker for the start of the astrological calendar origin of the celestial coordinate grid origin of the tropical zodiac point where the sun crosses the celestial equator reference point for measuring celestial longitude starting point for calculating celestial coordinates starting point of the ecliptic initial reference for determining celestial positions initial point of the celestial sphere first point of Aries northward equinox astrological new year beginning of the solar year beginning of the zodiac celestial equator crossing commencement of the astronomical year commencement of the sidereal year zero point of the celestial coordinate system