蔀

玄始历采用600年置222个闰月代替十九年七闰法。更广泛被使用的的大明历亦弃十九年七闰法。

蔀或篰是中国古代历法的时间单位。指回归年与朔望月与平太阳日的最短循环（时间长度极接近的最小公倍数）。在西方，类似的概念为 Callippic cycle。

由于回归年与朔望月之最小公倍数并未恰好一日长，若再取与太阳日之公倍数，则能更妥善的制历，因此出现「蔀」。

单词	Callippic cycle
释义	Callippic cycle 中文百科蔀蔀或篰是中国古代历法的时间单位。指回归年与朔望月与平太阳日的最短循环（时间长度极接近的最小公倍数）。在西方，类似的概念为 Callippic cycle。由于回归年与朔望月之最小公倍数并未恰好一日长，若再取与太阳日之公倍数，则能更妥善的制历，因此出现「蔀」。英语百科 Callippic cycle 蔀 For astronomy and calendar studies, the Callippic cycle (or Calippic) is a particular approximate common multiple of the year (specifically the tropical year) and the synodic month, that was proposed by Callippus during 330 BC. It is a period of 76 years, as an improvement of the 19-year Metonic cycle.
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Callippic cycle

蔀

Callippic cycle 蔀