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A full Long Count date not only includes the five digits of the Long Count, but the 2 character Tzolkʼin and the two-character Haabʼ dates as well. The five digit Long Count can therefore be confirmed with the other four characters (the "calendar round date").
The Aztec sun stone and a depiction of its base. The Aztec or Mexica calendar is the calendrical system used by the Aztecs as well as other Pre-Columbian peoples of central Mexico. It is one of the Mesoamerican calendars, sharing the basic structure of calendars from throughout the region.
This category contains articles relating to calendrical systems and divinatory almanacs of the Postclassic Aztec culture(s) of pre-Columbian Mesoamerica The main article for this category is Aztec calendars .
The Long Count calendar identifies a date by counting the number of days from August 11, 3114 BCE in the proleptic Gregorian calendar or September 6, 3114 BCE in the Julian Calendar (-3113 astronomical). The Long Count days were tallied in a modified base-20 scheme. Thus 0.0.0.1.5 is equal to 25, and 0.0.0.2.0 is equal to 40.
The Aztec also used the dam to control the level of water in the lake and prevent their city from being flooded during times of heavy rains. To prevent flooding, the Aztec constructed an inner system of channels that helped to control the water level and held the level steady during flooding and periods of intense rains.
Together, these calendars would coincide once every 52 years, the so-called "calendar round," which was initiated by a New Fire ceremony. Aztec years were named for the last day of the 18th month according to the 260-day calendar the tonalpōhualli. The first year of the Aztec calendar round was called 2 Acatl and the last 1 Tochtli.
Aztec calendar (sunstone) Mesoamerican chronology divides the history of prehispanic Mesoamerica into several periods: the Paleo-Indian (first human habitation until 3500 BCE); the Archaic (before 2600 BCE), the Preclassic or Formative (2500 BCE – 250 CE), the Classic (250–900 CE), and the Postclassic (900–1521 CE); as well as the post European contact Colonial Period (1521–1821), and ...
The writing system used is very close to the Maya script, using affixal glyphs and Long Count dates, but is read only in one column at a time as is the Zapotec script. It has been suggested that this Isthmian or Epi-Olmec script is the direct predecessor of the Maya script, thus giving the Maya script a non-Maya origin.