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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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"celestial horizon." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 23 May. 2017 <http://www.encyclopedia.com>.

"celestial horizon." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (May 23, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/celestial-horizon

"celestial horizon." The Columbia Encyclopedia, 6th ed.. . Retrieved May 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/celestial-horizon

horizon, celestial

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

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"horizon, celestial." World Encyclopedia. . Encyclopedia.com. 23 May. 2017 <http://www.encyclopedia.com>.

"horizon, celestial." World Encyclopedia. . Encyclopedia.com. (May 23, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/horizon-celestial

"horizon, celestial." World Encyclopedia. . Retrieved May 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/horizon-celestial