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A primary is a celestial body at the exact centre of a crystal sphere. In a standard system planets usually orbit a primary. Most primaries are suns (large fire bodies), but primaries can also be earth bodies, air bodies or water bodies.[1]


  1. Jeff Grubb (1989). AD&D Adventures in Space. TSR. ISBN 0-88038-762-9. Concordance of Arcane Space. p. 74.

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