Metonic cycle

Noun

 * 1)  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.

Translations

 * Chinese: 默冬章
 * French: cycle métonique
 * German: Metonischer Zyklus
 * Greek: Μετωνικός κύκλος (Metonikos kyklos, Metonikos kiklos)
 * Irish: ciogal gealaí
 * Japanese: メトン周期
 * Latin: cyclus Metonicus