ALL meanings of hour circle
hour cir·cle
H h - noun hour circle 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. 1
- noun hour circle a great circle on the celestial sphere passing through the celestial poles and a specified point, such as a star 0
- noun hour circle any great circle of the celestial sphere which passes through the celestial poles and is therefore perpendicular to the celestial equator 0