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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.



The boundary between one house and another, or between one sign and another. The ancients considered a planet within 5 degrees of the cusp of the next house to be in the next house. This rule may derive from the heliacal risings of planets when they were obscured by the Sun's rays, or it may derive from the notion of house cusps having an orb of influence that extends 5 degrees into the preceding house.

Thus, for several minutes after sunrise, the Sun remains in the first house. Sometimes aspects to relevant house cusps give useful information in horary questions. Campanus and Regiomontanus regarded the house cusps to be points of maximum intensity of influence of the house rather than the starting points of the house

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