celestial sphere(n = noun.location) empyrean, firmament, heavens, sphere, vault of heaven, welkin - the apparent surface of the imaginary sphere on which celestial bodies appear to be projected;
is a kind of surface
has parts: apex, apex of the sun's way, solar apex, celestial point, nadir, zenith, zodiac

armillary sphere, attraction sphere, celestial, celestial body, celestial city, celestial equator, celestial globe, celestial guidance, celestial hierarchy, celestial horizon, celestial latitude, celestial longitude, celestial mechanics, celestial navigation, celestial orbit, celestial point, celestial pole, north celestial pole, political sphere, south celestial pole, sphere, sphere of influence, thelonious sphere monk