The Tōnalpōhualli (Nahuatl pronunciation: [toːnaɬpoːˈwalːi]), meaning “count of days” in Nahuatl, is a Mexica version of the 260-day calendar in use in pre-Columbian Mesoamerica. This calendar is solar and consists of 20 13-day periods called trecenas. Each trecena is ruled by a different deity. Different graphic representations for the twenty day names have existed among certain ethnic, linguistic, or archaeologically identified peoples.

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