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The Perpetual Calendar

 

A perpetual calendar is a mechanism that automatically takes into account the varying number of days in each month as well as leap years. Many also possess a moon phase function with indicates the waxing and waning of the moon. Most perpetual calendars are based on the Gregorian calendar so it will not need correction for more then a century. Other perpetual calendars can be secular perpetual calendars or Jewish perpetual calendars. The perpetual calendar as inferred will display the day, date, month, and leap year cycle. Some perpetual calendar like the Audemars Piguet Millenary Perpetual Calendar also indicate calendar weeks. Obviously the perpetual calendar is a highly intricate mechanism that presents the watchmaker with a considerable challenge.

 

 

 

 

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