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celestial equator |
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celestial equator: see equatorial coordinate system equatorial coordinate system, the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial objects on the celestial sphere . The celestial sphere is an imaginary sphere with the observer at its center. ..... Click the link for more information. . celestial equator the great circle lying on the celestial sphere the plane of which is perpendicular to the line joining the north and south celestial poles celestial equator [sə′les·chəl i′kwād·ər] (astronomy) The primary great circle of the celestial sphere in the equatorial system, everywhere 90° from the celestial poles; the intersection of the extended plane of the equator and the celestial sphere. Also known as equinoctial. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| During both the winter and summer solstices, the sun's position on the celestial sphere reaches its greatest distance above or below the celestial equator. Last fall, Hu and McMahon used Keck to scan a patch of sky near the celestial equator. At this point also, the celestial equator and the ecliptic equator will be at its farthest point. |
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