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An illustration depicting an ancient Mexican calendar. The Maya and Aztec calendars are the most familiar of the Mexican calendars, but similar ones were used by other cultures.<br/><br/> Common to all Mesoamerican cultures was the 260-day ritual calendar that had no confirmed correlation to astronomical or agricultural cycles.<br/><br/> These were used in combination with a separate 365-day calendar to create a 52-year cycle known as a calendar round.