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Encyclopedic overview
The Aztec or Mexica calendar is the calendrical system used by the Aztecs as well as other Pre-Columbian peoples of central Mexico. It is one of the Mesoamerican calendars, sharing the basic structure of calendars from throughout the region.
The Aztec sun stone depicts calendrical symbols on its inner ring but did not function as an actual calendar.
Excerpted from Wikipedia’s “Aztec calendar” article, available under the CC BY-SA 4.0 licence.