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  1. Oxford Dictionary

    Metonic cycle

    • IPA[mɪˈtɒnɪk]

    英式

    • n.
      a period of 19 years (235 lunar months), after which the new and full moons return to the same day of the year. It was the basis of the ancient Greek calendar, and is still used for calculating movable feasts such as Easter.

    • noun: Metonic cycle, plural noun: Metonic cycles