celestial horizon


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celestial horizon

n.
A great circle on the celestial sphere having a plane that passes through the center of the earth and is parallel to an observer's horizon. Also called rational horizon.

celestial horizon

n
(Astronomy) See horizon2b

ho•ri•zon

(həˈraɪ zən)

n.
1. the line or circle that forms the apparent boundary between earth and sky.
2.
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 such a circle (sensible horizon).
b. the great circle of the celestial sphere whose plane passes through the center of the earth and is parallel to the sensible horizon of a given position, or the plane of such a circle (celestial horizon).
3. the limit or range of perception, knowledge, or the like.
4. Usu., horizons. the scope of a person's interest, education, understanding, etc.
5. a thin, distinctive geological stratum useful for stratigraphic correlation.
6. any of the series of distinctive layers found in a vertical cross section of any well-developed soil.
[1540–50; < Latin horizōn < Greek horízōn(kýklos) bounding (circle), present participle of horízein to bound, limit]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.celestial horizon - the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
great circle - a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
References in periodicals archive ?
It is as if the dutiful, loving daughter meant to turn the father/astronomer's gaze away from the celestial horizon and contemplations back to the earth, back to the earthly passions of his daughter.
In addition, the club publishes the Celestial Horizons newsletter, posts a Web site, loans telescopes to members and hosts meetings, children's activities and even a booth at the Ventura County Fair, Seck said.