intercalation
Sign in to saveinsertion 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.