Hour'-cîr'cle, n.

(our'sir'kl), n. (Astron.) (a). Any circle of the sphere passing through the two poles; especially, one of the circles drawn on an artificial globe through the pole, and dividing the equator into spaces of 15°, or one hour, each. (b). A circle upon an equatorial telescope lying parallel to the plane of the earth's equator, and graduated in hours and subdivisions of hours of right ascension.