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Word Entries containing the term: “cycles
Metonic cycle (S) (noun), Metonic cycles (pl)
A period of nineteen years after which the phases of the Moon reoccur on the same days of the year: After the span of 19 years, the lunar calendar starts on the same date based on the Metonic cycle.

A series of four or five eclipses also occur on the same dates after this interval.

This entry is located in the following unit: Astronomy and related astronomical terms (page 16)