September equinox

Thesaurus

Noun

September equinox - September 22 autumnal equinox, fall equinoxSep, Sept, September - the month following August and preceding Octoberequinox - 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 lengthautumn, fall - the season when the leaves fall from the trees; "in the fall of 1973"

September equinox

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.

September equinox

September equinox

equinox

September equinox

Synonyms for September equinox

noun September 22

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