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- In astronomy, an equinox is either of two places on the celestial sphere at which the ecliptic intersects the celestial equator1. The equinox associated with the Sun's ascending node is used as the conventional origin of celestial coordinate systems and referred to simply as "the equinox"1. More precisely, an equinox is traditionally defined as the time when the plane of Earth's equator passes through the geometric center of the Sun's disk2. Equivalently, this is the moment when Earth's rotation axis is directly perpendicular to the Sun-Earth line, tilting neither toward nor away from the Sun2.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.In astronomy, an equinox is either of two places on the celestial sphere at which the ecliptic intersects the celestial equator. Although there are two such intersections, the equinox associated with the Sun 's ascending node is used as the conventional origin of celestial coordinate systems and referred to simply as "the equinox".en.wikipedia.org/wiki/Equinox_(celestial_coordinates)More precisely, an equinox is traditionally defined as the time when the plane of Earth 's equator passes through the geometric center of the Sun 's disk. Equivalently, this is the moment when Earth's rotation axis is directly perpendicular to the Sun-Earth line, tilting neither toward nor away from the Sun.en.wikipedia.org/wiki/Equinox
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Equinox (celestial coordinates) - Wikipedia
In astronomy, an equinox is either of two places on the celestial sphere at which the ecliptic intersects the celestial equator. Although there are two such intersections, the equinox associated with the Sun's ascending node is used as the conventional origin of celestial coordinate systems and referred … See more
The equinox moves, in the sense that as time progresses it is in a different location with respect to the distant stars. Consequently, star catalogs over the years, even over the … See more
Sidereal time is the hour angle of the equinox. However, there are two types: if the mean equinox is used (that which only includes precession), it is called mean sidereal time; if the … See more
Besselian equinoxes and epochs
A Besselian epoch, named after German mathematician and astronomer Friedrich Bessel (1784–1846), … See moreIn modern astronomy the ecliptic and the equinox are diminishing in importance as required, or even convenient, reference concepts. (The equinox remains important in ordinary civil use, in defining the seasons, however.) This is for several reasons. One … See more
Wikipedia text under CC-BY-SA license Equinox (celestial coordinates) - Simple English Wikipedia, the …
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WebFeb 26, 2019 · Unlike Earth coordinates, celestial coordinates change due to the slow wobble of Earth's axis called precession. Precession causes the equinox points to drift westward at a rate of 50.3 arcseconds annually. …
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What Are Celestial Coordinates? - Sky & Telescope
WebJul 20, 2006 · The celestial coordinate system, which serves modern astronomy so well, is firmly grounded in the faulty world-view of the ancients. They believed the Earth was motionless and at the center of creation. …
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