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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.

 

Great Circle

Any circle capable of cutting a sphere into two equal halves, forming a flat plane, which also passes through the inside of the sphere. Astrology uses several systems of celestial coordinates which are great circles drawn on the inside of the celestial sphere. The ecliptic, the celestial equator and the prime vertical are examples of some of the great circles used in astrology.

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