celestial horizon

The great circle of the celestial sphere, equidistant from the zenith and the nadir. It is the intersection of the sensible and rational horizons at infinity. Its plane passes through the center of the earth.

Aviation dictionary. 2014.

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  • Celestial horizon — Horizon Ho*ri zon, n. [F., fr. L. horizon, fr. Gr. ? (sc. ?) the bounding line, horizon, fr. ? to bound, fr. ? boundary, limit.] 1. The line which bounds that part of the earth s surface visible to a spectator from a given point; the apparent… …   The Collaborative International Dictionary of English

  • Celestial horizon — The celestial horizon, also called the rational horizon, is a great circle parallel to the horizon, the center of which is the center of the Earth.ee also*Celestial sphere …   Wikipedia

  • celestial horizon — noun the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth • Syn: ↑horizon • Hypernyms: ↑great circle …   Useful english dictionary

  • celestial horizon — Astron. See under horizon (def. 2b). [1895 1900] * * * …   Universalium

  • celestial horizon — celes′tial hori′zon n. astron. See under horizon 2), b) • Etymology: 1895–1900 …   From formal English to slang

  • Horizon — Ho*ri zon, n. [F., fr. L. horizon, fr. Gr. ? (sc. ?) the bounding line, horizon, fr. ? to bound, fr. ? boundary, limit.] 1. The line which bounds that part of the earth s surface visible to a spectator from a given point; the apparent junction of …   The Collaborative International Dictionary of English

  • Celestial sphere — [ celestial equator.] In astronomy and navigation, the celestial sphere is an imaginary rotating sphere of gigantic radius , concentric and coaxial with the Earth. All objects in the sky can be thought of as lying upon the sphere. Projected from… …   Wikipedia

  • Horizon (disambiguation) — Horizon is the line at which the sky and the earth s surface appear to meet.Horizon or horizons may also refer to:Business* Horizon Global, a corporation specializing in media compression technology, peer to peer video telephony, and video on… …   Wikipedia

  • horizon — /heuh ruy zeuhn/, n. 1. the line or circle that forms the apparent boundary between earth and sky. 2. Astron. a. the small circle of the celestial sphere whose plane is tangent to the earth at the position of a given observer, or the plane of… …   Universalium

  • horizon — /həˈraɪzən / (say huh ruyzuhn) noun 1. the line or circle which forms the apparent boundary between earth and sky (apparent horizon or visible horizon). 2. Astronomy a. the plane which is tangent to the earth at the place of the observer and… …   Australian English dictionary

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