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abstraction > mathematical concept > geometrical object > conic section > ellipse > circle > great circle > hour circle
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hour circle
subjectfact 
hour circlehas definition A great circle passing through the celestial poles - i.e., perpendicular to the celestial equator.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:32:38.0
is a kind of great circle2001-09-27 09:32:38.0
conic sectionhas dimensions 22001-09-27 09:32:37.0