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Bikini calendars

A calendar is a system for naming periods of time, typically days. These names are known as calendar dates. Cycles in a calendar are often synchronised with the perceived motion of astronomical objects.

A calendar is also a physical device (often paper). This is the most common usage of the word.

As a subset, 'calendar' is also used to denote a list of particular set of planned events (for example, court calendar).

Source : wikipedia 

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Article : Calendar