The Mexica calendar is the dating system based on the Mayan calendar used by the Aztecs as well as other Pre-Columbian peoples of central Mexico. Like the Mayan calendrical system, the Aztec calendar consisted of a ritual cycle of 260 days and a 365-day civil cycle.

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Audio credits: Everything Everywhere Daily podcast with Gary Arndt: Leap Years and Leap Day (episode 1333; Glassbox Media). Audio excerpts reproduced under the Fair Use (Fair Dealings) Legal Doctrine for purposes such as criticism, comment, teaching, education, scholarship, research and news reporting.