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The Aztec sun stone, often erroneously called the calendar stone, is on display at the National Museum of Anthropology in Mexico City. The actual Aztec calendar consists of a 365-day calendar cycle called xiuhpōhualli (year count), and a 260-day ritual cycle called tōnalpōhualli (day count).
East side of stela C, Quirigua with the mythical creation date of 13 baktuns, 0 katuns, 0 tuns, 0 winals, 0 kins, 4 Ahau 8 Cumku – August 11, 3114 BCE in the proleptic Gregorian calendar. The Mesoamerican Long Count calendar is a non-repeating base-20 and base-18 calendar used by pre-Columbian Mesoamerican cultures, most notably the Maya.
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 symbol used for "zero" is a shell glyph, which is seen on the stone carving. Although the Olmec didn't leave behind any statues or reliefs with a "zero" glyph, the use of the Long Count calendar requires the knowledge of this concept since it is based on a place-value number system. [54]
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 .
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.
A date inscription in the Maya Long Count on the east side of Stela C from Quirigua showing the date for the last Creation. It is read as 13.0.0.0.0 4 Ahau 8 Kumku and is usually correlated as 11 or 13 August, 3114 BC on the Proleptic Gregorian calendar. The date of 13.0.0.0.0 4 Ahau 3 Kʼankʼin is usually correlated as 21 or 23 December 2012.
The "Long Count" portion of the Maya calendar uses a variation on the strictly vigesimal numerals to show a Long Count date. In the second position, only the digits up to 17 are used, and the place value of the third position is not 20×20 = 400, as would otherwise be expected, but 18×20 = 360 so that one dot over two zeros signifies 360.