Trecena

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A trecena is a 13-day period used in pre-Columbian Mesoamerican calendars, which divides the 260-day calendar into 20 trecena of 13 days each. The trecena is particularly associated with the Aztecs, but also features prominently in the calendars of the Maya, Zapotec, Mixtec, Olmec 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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