Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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celestial equator a great circle, corresponding to the earth's equator, on the celestial sphere.
celestial navigation navigation based on the position of the sun, moon, and stars.
celestial pole either of two points in the celestial sphere that the earth's axis would intersect if it were extended.
celestial sphere the infinitely large, imaginary sphere around the earth in which the stars, planets, and other celestial objects seem to be located.