vertical circle

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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.

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vertical circle

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

vertical circle A form of meridian circle which can be rotated about a vertical axis so that observations may be made in two orientations 180 ° apart. Zenith distance is measured by combining the circle readings on a star in the two orientations; the change in the instrumental zero point between orientations is measured by a spirit level.

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The Oxford American College Dictionary | 2009 | © The Oxford American College Dictionary 2009, originally published by Oxford University Press 2009. (Hide copyright information) Copyright

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