hour circle

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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 declination .

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hour circle

A Dictionary of Astronomy | 1997 | Â© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

hour circle A great circle on the celestial sphere passing through a celestial object and the celestial poles; also known as meridian of hour angle. It is perpendicular to the celestial equator.

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"hour circle." A Dictionary of Astronomy. 1997. Encyclopedia.com. 17 Dec. 2009 <http://www.encyclopedia.com>.

"hour circle." A Dictionary of Astronomy. 1997. Encyclopedia.com. (December 17, 2009). http://www.encyclopedia.com/doc/1O80-hourcircle.html

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