day of autumnal equinox

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• 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

• autumnal equinox — i. The point of intersection of the ecliptic and celestial equator (equinoctial) when the sun is moving from north to south. Also called the first point of Libra. ii. The time of the crossing of the sun across the celestial equator from north to… …   Aviation dictionary

• 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 — /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… …  

• 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 —   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 — e•qui•nox [[t]ˈi kwəˌnɒks, ˈɛk wə [/t]] n. astron. 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) and Sept. 22… …   From formal English to slang

• equinox — n. 1 the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length. 2 = equinoctial point. Phrases and idioms: autumn (or autumnal) equinox about 22 Sept. spring (or vernal) equinox… …   Useful english dictionary

• Vernal Equinox —    The first day of spring, about March 21, this is when the day and night are of equal length and the Sun rises due east and sets due west. See Autumnal Equinox …   The writer's dictionary of science fiction, fantasy, horror and mythology