Calendar::month Years::solar Every::number Lunar::second Egyptian::julian Coptic::usually
Intercalation 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 both days and months.
Intercalation (timekeeping) sections
Intro Solar calendars Lunisolar calendars Islamic calendars Leap seconds Other uses See also References
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