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Using as an example the Long Count date of 9.10.11.17.0 (Long Count date mentioned on the Palenque Palace Tablet), first calculate the number of days that have passed since the zero date (August 11, 3114 BCE; GMT correlation, in the Proleptic Gregorian calendar, September 6, −3113 Julian astronomical).
In the original Roman calendar, a lunisolar calendar, a 13th leap month called Mercedonius was periodically inserted between 23 February and 24 February to keep the calendar in line with the solar year. In most 13-month calendars, the leap year day is added every four years as an intercalary day between the year end day and the New Year's Day.
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.
His correlation argues that the first day of the Mexica year was February 13 of the old Julian calendar or February 23 of the current Gregorian calendar. Using the same count, it has been the date of the birth of Huitzilopochtli, the end of the year and a cycle or "Tie of the Years", and the New Fire Ceremony, day-sign 1 Tecpatl of the year 2 ...
A different form of calendar was used to track longer periods of time, and for the inscription of calendar dates (i.e., identifying when one event occurred in relation to others). This form, known as the Long Count, is based upon the number of elapsed days since a mythological starting-point. According to the calibration between the Long Count ...
The 360-day calendar is a method of measuring durations used in financial markets, in computer models, in ancient literature, and in prophetic literary genres.. It is based on merging the three major calendar systems into one complex clock [citation needed], with the 360-day year derived from the average year of the lunar and the solar: (365.2425 (solar) + 354.3829 (lunar))/2 = 719.6254/2 ...
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Misinterpretation of the Mesoamerican Long Count calendar was the basis for a popular belief that a cataclysm would take place on December 21, 2012. December 21, 2012 was simply the day that the calendar went to the next bʼakʼtun, at Long Count 13.0.0.0.0. The date of the start of the next b'ak'tun (Long Count 14.0.0.0.0) is March 26, 2407.