Relating to the Callippic cycle, an ancient astronomical calculation of 76 solar years used by Greek astronomers to predict lunar and solar eclipses.
From Callippus, a Greek astronomer from around 370-310 BCE who refined earlier eclipse prediction methods. The adjective form uses '-ic,' common for deriving descriptors from proper names in scientific terminology.
Callippus was so brilliant that his 76-year cycle was more accurate than earlier methods by Meton, and astronomers used it for over 1,500 years—it's one of the first examples of humans mathematically modeling celestial patterns with impressive precision.
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