celestial sphere celestial pole • celestiality · · · Info · Definitions · Synonyms · Characters · · celestial sphere · · Text Common · · Latin · · Scripts 16 · · Length 4 · · Syllables Definitions · · · (noun) the apparent surface of the imaginary sphere on which celestial bodies appear to be projected. Synonyms: celestial sphere, sphere, empyrean, firmament, heavens, vault of heaven, welkin. · · Noun Definition 1 Synonyms · · · sphere · · Synonym 1 empyrean · · Synonym 2 firmament · · Synonym 3 heavens · · Synonym 4 vault of heaven · · Synonym 5 welkin · · Synonym 6 Characters · · space U+0020 a latin small letter a U+0061 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 p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074