Perpetual calendar
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A perpetual calendar is a calendar which is good for a span of many years, such as the Runic calendar.
For the Gregorian calendar, a perpetual calendar often consists of 14 one-year calendars, plus a table to show which one-year calendar is to be used for any given year. Note that such a perpetual calendar fails to indicate the dates of moveable feasts such as Easter.
The Perpetual Calendar has 14 one-year calendars, one for each common year (year that does not have a February 29) that starts on each day of the week, and one for each leap year that starts on each day of the week.
Also certain calendar reforms may be considered to be perpetual calendars, such as the World calendar and International Fixed Calendar.fr:Calendrier fixe pt:Calendário perpétuo sv:Evighetskalender