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A 'trecena' is a 13-day period used in pre-Columbian Mesoamerican calendars, which divides the 260-day calendar (the ''tonalpohualli'') into 20 trecena of 13 days each. Trecena is derived from the Spanish chroniclers and translates to 13 suppers or feasts. It is associated with the Aztecs, but is called different names in the calendars of the Maya, Zapotec, Mixtec, and others of the region.
Many surviving Mesoamerican codices, such as Codex Borbonicus, are divinitory calendars, based on the 260-day year, with each page representing one trecena.

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See also

See also

★ Aztec calendar

★ Maya calendar