hour circle hour book • hourglass screw · · · Info · Definitions · Synonyms · Characters · · hour circle · · Text Common · · Latin · · Scripts 11 · · Length Definitions · · · (noun) a great circle on the celestial sphere that passes through both celestial poles. · · Noun Definition 1 Synonyms · · · hour · · Synonym 1 hr · · Synonym 2 60 minutes · · Synonym 3 time of day · · Synonym 4 minute · · Synonym 5 Characters · · space U+0020 c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C o latin small letter o U+006F r latin small letter r U+0072 u latin small letter u U+0075