10 results for: equinox

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
e·qui·nox    Audio Help   [ee-kwuh-noks, ek-wuh-] Pronunciation Key
–noun
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 22 (autumnal equinox).
2.either of the equinoctial points.

[Origin: 1350–1400; ME < ML equinoxium, for L aequinoctium the time of equal days and nights (aequi- equi- + noct- (s. of nox) night + -ium -ium)]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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equinox

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American Heritage Dictionary - Cite This Source - Share This
e·qui·nox    Audio Help   (ē'kwə-nŏks', ěk'wə-)  Pronunciation Key 


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n.  
  1. Either of two points on the celestial sphere at which the ecliptic intersects the celestial equator.
  2. Either of the two times during a year when the sun crosses the celestial equator and when the length of day and night are approximately equal; the vernal equinox or the autumnal equinox.


[Middle English, from Old French equinoxe, from Medieval Latin aequinoxium, from Latin aequinoctium : aequi-, equi- + nox, noct-, night; see nekw-t- in Indo-European roots.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Online Etymology Dictionary - Cite This Source - Share This
equinox 
c.1391, from O.Fr. equinoxe, from M.L. equinoxium "equality of night (and day)," from L. æquinoctium, from æquus "equal" + nox (gen. noctis) "night." The O.E. translation was efnniht.

Online Etymology Dictionary, © 2001 Douglas Harper
WordNet - Cite This Source - Share This
equinox

noun
1. 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 length 
2. (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic [syn: equinoctial point

WordNet® 3.0, © 2006 by Princeton University.
Kernerman English Multilingual Dictionary (Beta Version) - Cite This Source - Share This
equinox [ˈekwinoks] noun
the time when the sun crosses the equator, about March 21 and September 23
Arabic: الإعْتِدال الرَّبيعي أو الخَريفي
Chinese (Simplified): 昼夜平分时春(秋)分点
Chinese (Traditional): 晝夜平分時春, *秋分點
Czech: rovnodennost
Danish: jævndøgn
Dutch: nachtevening
Estonian: võrdpäevsus
Finnish: päiväntasaus
French: équinoxe
German: die Tag— und Nachtgleiche
Greek: ισημερία
Hungarian: napéjegyenlőség
Icelandic: jafndægur
Indonesian: ekuinoks
Italian: equinozio
Japanese: 春 分
Korean: 주야 평분시
Latvian: ekvinokcija
Lithuanian: ekvinokcija
Norwegian: jevndøgn
Polish: zrównanie dnia z nocą
Portuguese (Brazil): equinócio
Portuguese (Portugal): equinócio
Romanian: echinox
Russian: равноденствие
Slovak: rovnodennosť
Slovenian: enakonočje
Spanish: equinoccio
Swedish: dagjämning
Turkish: gün-tün eşitliği
Kernerman English Multilingual Dictionary (Beta Version), © 2000-2006 K Dictionaries Ltd.
The American Heritage Science Dictionary - Cite This Source - Share This
equinox    Audio Help   (ē'kwə-nŏks')  Pronunciation Key 
  1. Either of the two points on the celestial sphere where the ecliptic (the apparent path of the Sun) crosses the celestial equator. ◇ The point at which the Sun's path crosses the celestial equator moving from south to north is called the vernal equinox. The vernal equinox marks the zero point in both the equatorial and ecliptic coordinate systems; horizontal angular distances (right ascension in the equatorial system and celestial longitude in the ecliptic system) are measured eastward from this point. The vernal equinox is also known as the first point of Aries because when first devised some 2,000 years ago this point occurred at the beginning of Aries in the zodiac. Because of the westward precession of the equinoxes, the vernal equinox is now located at the beginning of Pisces. ◇ The point at which the Sun's path crosses the celestial equator moving from north to south is called the autumnal equinox.
  2. Either of the two corresponding moments of the year when the Sun is directly above the Earth's equator. The vernal equinox occurs on March 20 or 21 and the autumnal equinox on September 22 or 23, marking the beginning of spring and autumn, respectively, in the Northern Hemisphere (and the reverse in the Southern Hemisphere). The days on which an equinox falls have about equal periods of sunlight and darkness. Compare solstice.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
American Heritage New Dictionary of Cultural Literacy, Third Edition - Cite This Source - Share This
equinox [(ee-kwuh-noks, ek-wuh-noks)]

The twice yearly times when the lengths of day and night are equal. At equinox, the sun is directly over the Earth's equator. The vernal equinox occurs about March 22 and the autumnal equinox about September 21.


[Chapter:] Physical Sciences and Mathematics


The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Equinox

E`qui*noc"tial\, a. [L. aequinoctials, fr. aequinoctium equinox: cf. F. ['e]quinoxial. See Equinox.]

1. Pertaining to an equinox, or the equinoxes, or to the time of equal day and night; as, the equinoctial line.

2. Pertaining to the regions or climate of the equinoctial line or equator; in or near that line; as, equinoctial heat; an equinoctial sun.

3. Pertaining to the time when the sun enters the equinoctial points; as, an equinoctial gale or storm, that is, one happening at or near the time of the equinox, in any part of the world.

Equinoctial colure (Astron.), the meridian passing through the equinoctial points.

Equinoctial line (Astron.), the celestial equator; -- so called because when the sun is on it, the nights and days are of equal length in all parts of the world. See Equator.

Thrice the equinoctial line He circled. --Milton.

Equinoctial points (Astron.), the two points where the celestial and ecliptic intersect each other; the one being in the first point of Aries, the other in the first point of Libra.

Equinoctial time (Astron.) reckoned in any year from the instant when the mean sun is at the mean vernal equinoctial point.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
Webster's Revised Unabridged Dictionary - Cite This Source - Share This

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. See Autumnal equinox, Vernal equinox, under Autumnal and Vernal.

When descends on the Atlantic The gigantic Stormwind of the equinox. --Longfellow.

2. Equinoctial wind or storm. [R.] --Dryden.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.

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