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. The term Pre-Columbian is used to refer to the cultures of the New World in the era before significant European influence. ... The Pre-Columbian people of Mesoamerica kept track of time with calendars which had ritual and religious meaning. ... A page from the Hindu calendar 1871-72. ... The Aztecs were a Pre-Columbian Mesoamerican people of central Mexico in the 14th, 15th and 16th centuries who built an extensive empire in the late Postclassic period of Mesoamerican chronology. ... A page from the Hindu calendar 1871-72. ... The Maya civilization is a Mesoamerican civilization, noted for the only known fully developed written language of the pre-Columbian Americas, as well as its spectacular art, monumental architecture, and sophisticated mathematical and astronomical systems. ... The Zapotec are an indigenous people of Mexico. ... Codex Zouche-Nuttall, a pre-Columbian piece of Mixtec writing, now in the British Museum The Mixtec (or Mixteca) are a Native American people centered in the Mexican state of Oaxaca. ... Monument 1, one of the four Olmec colossal heads at La Venta. ...
Many surviving Mesoamerican codices, such as Codex Borbonicus, are divinitory calendars, based on the 260-day year, with each page representing one trecena. The original page 13 of the Codex Borbonicus, showing the 13th trecena of the Aztec sacred calendar. ...
The Aztec calendar was the calendar of the Aztec people of Pre-Columbian Mexico. ... The Maya calendar is actually a system of distinct calendars and almanacs used by the Maya civilization of pre-Columbian Mesoamerica, and by some modern Maya communities in highland Guatemala. ...
All three of the intervals of the vientena, trecena and novena are apparently fundamental to the design of the solar system.
The trecena and vientena have their first days coincide every 13 x 20 = 260 days, forming the sacred round, which has been discussed at length in my articles relating to holy days.
Using the 13-day trecena as the unit of time for the Venus calendar, one can count 11 cycles of exactly five mercs (585 days) each followed by one cycle of 572 days, for a total of 7,007 days.
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