Adjective
English Wikipedia has an article on:Callippic cycleWikipedia
Callippic (not comparable)
(astronomy) Based upon a common multiple of the year and the month
During the next century, Callippus developed the Callippic cycle of four 19-year periods for a 76-year cycle with a mean year of exactly 365.25 days. Source: Internet
Speculating a Babylonian origin for the Callippic year is hard to defend, since Babylon did not observe solstices thus the only extant System B year length was based on Greek solstices (see below). Source: Internet
The 84-year cycle is equivalent to a Callippic 4×19-year cycle (including 4×7 embolismic months) plus an 8-year cycle (including 3 embolismic months) and so has a total of 1039 months (including 31 embolismic months). Source: Internet