Research regarding enduring substantial ideas inscribed towards oracle bones shows an effective Chinese lunisolar calendar, which have intercalation out-of lunar days, dating back the latest Shang dynasty of one's fourteenth century B
C.Elizabeth. Some intercalation strategies had been install toward very early calendars, such as the nineteen-seasons and you may 76-season lunar stage time periods you to definitely was created identified throughout the Western since the Metonic years and you may Callipic period.