vernal (autumnal) equinox

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• autumnal equinox — noun 1. September 22 • Syn: ↑September equinox, ↑fall equinox • Ant: ↑vernal equinox • Hypernyms: ↑equinox • Part Holonyms: ↑fall …   Useful english dictionary

• Autumnal Equinox —    The first day of fall, about September 23. This is when the day and night are of equal length and the Sun rises due east and sets due west. See Vernal Equinox …   The writer's dictionary of science fiction, fantasy, horror and mythology

• Equinox — E qui*nox, n. [OE. equinoxium, equenoxium, L. aequinoctium; aequus equal + nox, noctis, night: cf. F. [ e]quinoxe. See {Equal}, and {Night}.] 1. The time when the sun enters one of the equinoctial points, that is, about March 21 and September 22 …   The Collaborative International Dictionary of English

• equinox — [ē′kwi näks΄, ek′wə näks] n. [ME < OFr equinoxe < ML aequinoxium < L aequinoctium < aequus (see EQUAL) + nox, NIGHT] 1. the time when the sun in its apparent annual movement along the ecliptic crosses the celestial equator, making… …   English World dictionary

• Equinox — This article is about the astronomical event when the sun is at zenith over the Equator. For other uses, see Equinox (disambiguation). For the same event happening on other planets and setting up a celestial coordinate system, see Equinox… …   Wikipedia

• equinox — /ee kweuh noks , ek weuh /, n. 1. the time when the sun crosses the plane of the earth s equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox or spring equinox) and September… …   Universalium

• equinox — 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… …   Aviation dictionary

• equinox — /ˈikwənɒks / (say eekwuhnoks), /ˈɛ / (say e ) noun 1. the time when the sun crosses the plane of the earth s equator, making night and day all over the earth of equal length, occurring about 21 March (vernal equinox, though in the Southern… …  

• vernal equinox — noun 1. March 21 • Syn: ↑March equinox, ↑spring equinox • Ant: ↑autumnal equinox • Hypernyms: ↑equinox • Hyponyms: ↑Noruz, ↑ …   Useful english dictionary

• equinox —   n. date on which sun crosses equator.    ♦ autumnal equinox, such date in autumn   (about Sept. 23).    ♦ vernal equinox, such date in spring (about March 21).    ♦ equinoctial, a. pertaining to equinox, or to place or time having day and night …   Dictionary of difficult words

• equinox — Synonyms and related words: aphelion, apogee, astronomical longitude, autumnal equinox, celestial equator, celestial longitude, celestial meridian, circle, colures, ecliptic, equator, equinoctial, equinoctial circle, equinoctial colure, galactic… …   Moby Thesaurus