Romjul and intercalation

The business of calculating years and dates is complicated, since calendars need to reconcile solar and lunar cycles. Different calendrical systems use different methods of reconciling the two cycles, inserting a day (February 29th in the Gregorian calendar), a week, or even a month in some calendars. This practice is called intercalation. It has also been suggested that the time between Yule and New Year is an intercalation.

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In Norway, the time between Yule and New Year is called Romj...