# celestial sphere

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Related to Celestial hemisphere: Celestial coordinate system

## celestial sphere

*n.*

An imaginary sphere of infinite extent with the earth at its center and on which the stars, planets, and other heavenly bodies appear to be located.

## celestial sphere

*n*

(Astronomy) an imaginary sphere of infinitely large radius enclosing the universe so that all celestial bodies appear to be projected onto its surface

## celes′tial sphere′

*n.*

the imaginary, infinite sphere formed by the sky, the center of which is a given observer's position.

[1875–80]

## celestial sphere

An imaginary sphere with Earth at its center. The stars, planets, sun, moon, and other heavenly bodies appear to be located on this sphere.

## celestial sphere

An imaginary sphere of infinite radius concentric with the Earth, on which all celestial bodies except the Earth are imagined to be projected.

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Noun | 1. | celestial sphere - the apparent surface of the imaginary sphere on which celestial bodies appear to be projectedapex of the sun's way, solar apex, 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 surface - the extended two-dimensional outer boundary of a three-dimensional object; "they skimmed over the surface of the water"; "a brush small enough to clean every dental surface"; "the sun has no distinct surface" 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 |

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