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celestial meridian |
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celestial meridian, vertical circle vertical circle, in astronomy, the great circle on the celestial sphere that passes from the observer's zenith through a given celestial body. In the altazimuth coordinate system the altitude of a body is measured along its vertical circle. ..... Click the link for more information. passing through the north celestial pole and an observer's zenith zenith, in astronomy, the point in the sky directly overhead; more precisely, it is the point at which the celestial sphere is intersected by an upward extension of a plumb line from the observer's location. ..... Click the link for more information. . It is an axis in the altazimuth coordinate system altazimuth coordinate system (ăltăz`əməth) or horizon coordinate system, ..... Click the link for more information. . |
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Heilbron's title refers specifically to the precise projections of the celestial meridian on a spate of church floors during this period (and well into the nineteenth century). |
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celestial meridian
