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(of a day or month) added to a calendar to align it with the solar year or another astronomical cycle
- The intercalary day in a leap year helps synchronize the calendar with Earth's orbit around the Sun.
- Some cultures include an intercalary month to keep their lunar calendars aligned with the solar year.
- In ancient Rome, an intercalary month called "Mercedonius" was occasionally added to the calendar.
- During certain years, an intercalary month is inserted to maintain the accuracy of the lunisolar calendar.