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hour circle
hour circle in astronomy, a secondary axis in the equatorial coordinate system . The hour circle of a celestial body is the great circle on the celestial sphere that passes through both the body and the north celestial pole. A star's hour circle is used in determining its right ascension and ... Read more |
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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.... Read more |
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great circle
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meridian circle
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small circle
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celestial meridian
celestial meridian vertical circle passing through the north celestial pole and an observer's zenith . It is an axis in the altazimuth coordinate system .... Read more |
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declination
declination in astronomy, one of the coordinates in the equatorial coordinate system . The declination of a celestial body is its angular distance north or south of the celestial equator measured along its hour circle .... Read more |
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transit instrument
transit instrument or transit, telescope devised to observe stars as they cross the meridian and used for determining time. Its viewing tube swings on a rigid horizontal axis restricting its movements to the arc of the meridian. In the field of view of the eyepiece are threads of spider web or... Read more |
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gavotte
gavotte , originally a peasant dance of the Gavots in upper Dauphiné, France. A type of circle dance characterized by lively, skipping steps, it was introduced at the court of Louis XIV and was used by Lully in his ballets and operas and by François Couperin and J. S. Bach in their... Read more |
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altazimuth coordinate system
altazimuth coordinate system or horizon coordinate system, astronomical coordinate system in which the position of a body on the celestial sphere is described relative to an observer's celestial horizon and zenith . The coordinates of a body in this system are its altitude and azimuth .... Read more |
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