hour circle(redirected from circle of right ascension)
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A great circle passing through the poles of the celestial sphere and intersecting the celestial equator at right angles.
(Astronomy) a great circle on the celestial sphere passing through the celestial poles and a specified point, such as a star
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.