A trecena is a 13-day period used in pre-Columbian Mesoamerican calendars. The 260-day calendar (the tonalpohualli) was divided into 20 trecenas. Trecena is derived from the Spanish chroniclers and translates to "a group of thirteen" in the same way that a dozen (or in Spanish docena) relates to the number twelve. 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 divinatory calendars, based on the 260-day year, with each page representing one trecena.
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Quetzalcoatl (ˌkɛtsəlkoʊˈætəl) is a deity in Aztec culture and literature. Among the Aztecs, he was related to wind, Venus, Sun, merchants, arts, crafts, knowledge, and learning. He was also the patron god of the Aztec priesthood. He was one of several important gods in the Aztec pantheon, along with the gods Tlaloc, Tezcatlipoca and Huitzilopochtli. Two other gods represented by the planet Venus are Tlaloc (ally and the god of rain) and Xolotl (psychopomp and its twin).
The tōnalpōhualli (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 (trecena) periods. Each trecena is ruled by a different deity. Graphic representations for the twenty day names have existed among certain ethnic, linguistic, or archaeologically identified peoples. The term for the Aztec day signs, tōnalpōhualli, comes from the root word Tona which means to give light or heat.
The calendrical systems devised and used by the pre-Columbian cultures of Mesoamerica, primarily a 260-day year, were used in religious observances and social rituals, such as divination. These calendars have been dated to early as ca. 1100 BCE. By 500 BCE at the latest, the essentials were fully defined and functional. 260-day calendars are still used in the Guatemalan highlands, Veracruz, Oaxaca and Chiapas, Mexico.