Metonic Cycle 2
Metonic Cycle 2 : A unit of time equal to 19 years, used in astronomy in predicting the phases of the Moon. By coincidence, 19 years is equal to 6939.602 days and 235 lunar months is equal to 6939.689 days, just 125 minutes longer. As a result, the phases of the Moon repeat almost exactly after 19 years. (Since 19 years can contain either 3 or 4 leap days, the recurrence isn't always exact as to the day of the month.) Many lunar calendars, such as the Chinese and Jewish calendars, share this 19-year cycle. The cycle is named for the ancient Greek astronomer Meton, who first used it for predictions around 433 BC
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