hour circle

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hour circle

n.
A great circle passing through the poles of the celestial sphere and intersecting the celestial equator at right angles.

hour circle

n
(Astronomy) a great circle on the celestial sphere passing through the celestial poles and a specified point, such as a star

hour′ cir`cle


n.
a great circle on the celestial sphere passing through the celestial poles and containing a point on the celestial sphere, as a star or the vernal equinox.
[1665–75]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hour circle - a great circle on the celestial sphere that passes through both celestial poles
great circle - a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center