(context, astronomy, calendar studies) A particular approximate common multiple of the tropical year and the synodic month; in other words, the 19-year period over which the lunar phases occur on the same dates.
- According to the Metonic Cycle, a lunar calendar begins on the same solar date every 19 years.
Etymology: Meton + -ic + cycle
- French: Cycle métonique
- German: Metonischer Zyklus
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