*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. [ 1913 Webster ]