Sometimes in a watch description, or even on it´s name, the "perpetual calendar" text appears, so what is it? A perpetual calendar is an mechanism which automatic updates the date having in account the different month-lengths as well as leap years - well generally speaking leap years until 2100. Date, day of the week, month and some times the 4 year cycle and moon phase are usually present. Some perpetual calendar watches examples: H. Moser & Cie Moser Perpetual Moon, Ulysse Nardin Acqua Perpetual Chronometer and the Glashutte Senator "Perpetual Calendar.
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