Research topic:equinox

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equinox

A Dictionary of Astronomy | 1997 | © A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

equinox Either of the two points at which the Sun's apparent yearly path (the ecliptic) intersects the celestial equator; or the dates on which this occurs—on March20(vernal equinox) and September 22 or 23 (autumnal equinox). These points are also known as the first point of Aries and the first point of Libra. When the term ‘equinox’ is used without qualification, the vernal (spring) equinox is meant. Around the time of the equinoxes, night and day are equal in length the world over. The equinox is not a fixed point, but moves because of precession and nutation. If only precession is taken into account, the resulting point is known as the mean equinox of date. If, however, nutation is also included, the point is known as the true equinox.

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Related entries from encyclopedias, dictionaries, and thesauruses

Equinox
Encyclopedia entry from: The Gale Encyclopedia of Science ...equator, marking the autumnal equinox and beginning of autumn. The...measured eastward from the vernal equinox—the point where...the celestial sphere are the equinoxes. When the sun reaches either equinox, it rises in a direction that...
equinox
Book article from: A Dictionary of Astronomy ...When the term ‘equinox’ is used without...qualification, the vernal (spring) equinox is meant. Around the time of the equinoxes, night and day are equal in length the world over. The equinox is not a fixed point, but...
vernal equinox
Book article from: A Dictionary of Astronomy vernal equinox (symbol ϒ) The point on the celestial...each year. It is also known as the spring equinox or the first point of Aries . It currently occurs on March20. At the vernal equinox, as with the autumnal equinox six months...
precession of the equinoxes
Book article from: The Columbia Encyclopedia, Sixth Edition precession of the equinoxes westward motion of the equinoxes along the ecliptic . This motion was first noted by Hipparchus...around the sun, is not affected by this motion. The equinoxes, which lie at the intersections of the celestial equator...
mean equinox
Book article from: A Dictionary of Astronomy mean equinox The direction to the equinox at a particular epoch, with the effect of nutation subtracted. The mean equinox therefore moves smoothly across the sky due to precession alone, without short-term oscillations due to nutation. See also True Equinox .

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