vault of heaven

Noun

1.

vault of heaven - the apparent surface of the imaginary sphere on which celestial bodies appear to be projected Synonyms: celestial sphere, empyrean, firmament, heavens, welkin, sphere

apex, apex of the sun's way, celestial point, celestial sphere, empyrean, firmament, heavens, nadir, solar apex, sphere, surface, welkin, zenith, zodiac