celestial horizon

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celestial horizon

celestial horizon one axis of the altazimuth coordinate system . It is the great circle on the celestial sphere midway between the observer's zenith and nadir; it divides the celestial sphere into two equal hemispheres. The observer may be unable to see all the stars that lie above his celestial horizon because of obstructions such as buildings, trees, or mountains; he may be able to see some stars that lie below his celestial horizon because of atmospheric refraction.

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horizon, celestial

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

horizon, celestial Great circle on the celestial sphere. It lies midway between the observer's zenith and nadir.

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