calippic

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CIDE DICTIONARY

calippic, a.

Of or pertaining to Calippus, an Athenian astronomer. [1913 Webster]

Calippic period, a period of seventy-six years, proposed by Calippus, as an improvement on the Metonic cycle, since the 6940 days of the Metonic cycle exceeded 19 years by about a quarter of a day, and exceeded 235 lunations by something more.