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March equinox
Thesaurus| Noun | 1. |  March equinox - March 21 spring equinox, vernal equinoxMar, March - the month following February and preceding Aprilequinox - either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal lengthNoruz, Nowrooz, Nowruz - (Persian) the new year holiday in Iran and Azerbaijan and Afghanistan and Pakistan and parts of India and among the Kurds; comes at the vernal equinoxspring, springtime - the season of growth; "the emerging buds were a sure sign of spring"; "he will hold office until the spring of next year" |
March equinox
March equinox[′märch ′ē·kwə‚näks] (astronomy) vernal equinox vernal equinox  Positions of sun and the earth at spring and autumnal equinoxes.i. One of the two points of intersection of the ecliptic and the celestial equators, occupied by the sun when its declination is 0°. Also called an equinoctial point. That point occupied on or about March 21, when the sun's declination changes from south to north, is called the vernal equinox, spring equinox, March equinox, or first point of Aries that point occupied on or about September 23, when the declination changes from north to south, is called the autumnal equinox, September equinox, or first point of Libra. Equinox is often used to mean vernal equinox, when referring to the origin of measurement of right ascension and celestial longitude. At the time of equinox, the duration of day and night is the same or equal.
ii. That instant the sun occupies one of the equinoctial points.LegalSeeEquinoxMarch equinox
Related to March equinox: September equinox, June solsticeSynonyms for March equinoxnoun March 21Synonyms- spring equinox
- vernal equinox
Related Words- Mar
- March
- equinox
- Noruz
- Nowrooz
- Nowruz
- spring
- springtime
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