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Dictionary of Astrological and Astronomical Terms

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

Copyright 2000-2019 OCA, Inc. All rights reserved. No portion of the dictionary may be reproduced in any form without written permission.

 

Parallax

The phenomenon Tycho Brahe described to account for an object's change in apparent position due to the changing position of the observer. The farther an object is away from Earth, the less the parallax. Thus this is used astrologically with calculations of the Moon. Everything else is far enough away that it does not have an accountable parallax along the Ecliptic. Measuring the Moon's distance topocentrically is calculating the Parallax Moon.


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