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Dictionary of Astrological and Astronomical Terms

Compiled by Julene Packer-Louis, Evan Bortnick, and Jackie Goldstein

Copyright 2000-2020 OCA, Inc. All rights reserved. No portion of the dictionary may be reproduced in any form without written permission.

 

Celestial Sphere

A sphere whose center point is Earth, with all of space in its entirety encompassed within this sphere. In the backdrop of the sky, every star we see is 'fixed' to this sphere, as well as those we don't see.

It is the 3-dimensional 'shell' that all of space is inside of; its boundaries are as infinite as the space/time continuum. Its apparent motion is due to the Earth's rotation

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