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intercalation

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insertion of a leap day, week, or month into some calendar years to make the calendar follow the seasons or moon phases

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Encyclopedic overview

Intercalation or embolism in timekeeping is the insertion of a leap day, week, or month into some calendar years to make the calendar follow the seasons or moon phases. Lunisolar calendars may require intercalations of days or months.

Solar calendars

Excerpted from Wikipedia’s “intercalation” article, available under the CC BY-SA 4.0 licence.