Brewer's: Callippic Period

The correction of the Metonic cycle by Callippos. In four cycles, or seventy-six years, the Metonic calculation was seven and a-half in excess. Callippos proposed to quadruple the period of Meton, and deduct a day at the end of it: at the expiration of which period Callippos imagined that the new and full moons returned to the same day of the solar year.

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