Callipus cycle

Japanese: カリポス周期 - かりぽすしゅうき(英語表記)Callipus cycle
Callipus cycle
A cycle of 27,759 days. This cycle was invented by the Greek Callippus (of Cyzicus) in 334 BC, and includes 28 leap months in 76 years, making 76 years = 940 calendar months, with a total of 27,759 days. Therefore, one year is 365.25 days, and one calendar month is 29.53085 days. It was called the 76-year method, and was one solution to the problem of how to best combine the solar year and the lunar month in the lunar calendar. It was known in China in the 5th century BC, and was incorporated into the quarter calendar that was in use at the time.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
2万7759日の周期。前334年にギリシアのカリポス(キュジコスの)の考案した周期で,76年に28回の閏(うるう)月を置き76年=940暦月とし,その総日数を2万7759日とする。したがって1年は365.25日,1暦月は29.53085日となる。太陰太陽暦で太陽年と朔望月(さくぼうげつ)をいかにうまく組み合わすかという問題に対する一つの解答で76年法と呼ばれた。中国でも前5世紀ごろには知られそのころ用いられていた四分暦にとり入れられていた。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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