Last Updated
：2025/11/20
Metonic cycle
Noun
Japanese Meaning
太陽年と朔望月の周期がほぼ一致する倍数としての周期、すなわち月の満ち欠けがほぼ同じ日に起こる19年周期の天文現象。
（ plural ）
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(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.
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Metonic cycle
The astronomer explained how the Metonic cycle, an approximate common multiple of the tropical year and the synodic month, helps align lunar months with the solar year in calendar design.
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The astronomer explained how the Metonic cycle, an approximate common multiple of the tropical year and the synodic month, helps align lunar months with the solar year in calendar design.
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