celestial sphere noun
: an imaginary sphere of infinite radius against which the celestial bodies appear to be projected and of which the apparent dome of the visible sky forms half
First Known Use of CELESTIAL SPHERE
Rhymes with CELESTIAL SPHERE
, elephant's ear
, free marketeer
celestial sphere noun (Concise Encyclopedia)
Apparent surface of the heavens, on which the stars seem to be fixed. For the purpose of establishing celestial coordinate systems to mark the positions of heavenly bodies, it can be thought of as a real sphere at an infinite distance from Earth. Earth's rotational axis, extended to infinity, touches this sphere at the northern and southern celestial poles, around which the heavens seem to turn. The intersection of the plane of Earth's Equator with the sphere marks the celestial equator.
Learn More About CELESTIAL SPHERE
Seen & Heard
What made you want to look up celestial sphere? Please tell us where you read or heard it (including the quote, if possible).