perpetual calendar

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perpetual calendar

[pər′pech·ə·wəl ′kal·ən·dər]
(astronomy)
A table or mechanical device used to determine the day of the week corresponding to any given date over a period of many years.
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The new "most complicated watch in the world," Vacheron Constantin's Reference 57260 (2015), features among its 57 complications no fewer than eight that refer to the Hebrew perpetual calendar.
Yet another complication is a perpetual calendar watch which takes into account the differing lengths of the months and the leap year, tracked by a single wheel inside the mechanism which only moves once every four years.
Audemars Piguet has introduced a black ceramic Royal Oak Perpetual Calendar for the Only Watch auction series.
In addition to the unique dial, the Only Watch unique piece is the first black ceramic perpetual calendar wristwatch to feature a black ceramic caseback with sapphire display back revealing a unique hand-finished black oscillating mass.