hour circle: Meaning and Definition of

hour' cir"cle

Pronunciation: [key]
— Astron. Astron.
  1. 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. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.