firmament

Noun
  1. is a type of: surface - the extended two-dimensional outer boundary of a three-dimensional object
    has:
    • apex, apex of the sun's way, solar apex - the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars
    • celestial point - a point in the heavens (on the celestial sphere)
    • nadir - the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected
    • zenith - the point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected
    • zodiac - a belt-shaped region in the heavens on either side to the ecliptic; divided into 12 constellations or signs for astrological purposes
    same as: celestial sphere, empyrean, heavens, sphere, vault of heaven, welkin

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