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  2. 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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  4. Equinox (celestial coordinates) - Simple English Wikipedia, the …

  5. Position of the Sun - Wikipedia

  6. Celestial Coordinates for Beginners - Sky & Telescope

    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. …

  7. Equinox (celestial coordinates) - Wikiwand

  8. 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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