The Calippic Period Is Frequently Referred To As A Date By Ptolemy.
This cycle seems to be neither more nor less than the Calippic period of seventy-six years, with the addition of a Greek octaeteris, or period of eight years, in order to disguise its true source, and give it an appearance of originality.
But the addition was very far from being an improvement on the work of Calippus; for instead of a difference of only five hours and fifty-three minutes between the places of the sun and moon, which was the whole error of the Calippic period, this difference, in the period of eighty-four years, amounted to one day, six hours and forty-one minutes.
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