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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).
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. The date of the start of the next piktun (a complete series of 20 bʼakʼtuns), at Long Count 1.0.0.0.0.0, is October 13, 4772.
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 Mayan calendar’s 819-day cycle has confounded scholars for decades, but recent research shows how it matches up to planetary cycles over a 45-year span.
A baktun / ˈ b ɑː k t uː n / [1] (properly bʼakʼtun) is 20 kʼatun cycles of the ancient Maya Long Count Calendar. It contains 144,000 days, equal to 394.26 tropical years . The Classic period of Maya civilization occurred during the 8th and 9th baktuns of the current calendrical cycle.
It is the second digit on the normal Maya long count date. For example, in the Maya Long Count date 12.19.13.15.12 (December 5, 2006), the number 19 is the kʼatun. There are 20 k'atuns in a baktun. The end of a kʼatun was marked by numerous ceremonies and, at Tikal, the construction of large twin pyramid complexes to host them. [2]
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.
There are three main Maya calendars: The Long Count is a count of days. There are examples of Long Counts with many places but most of them give five places since the mythical creation date – 13.0.0.0.0. The Tzolkʼin is a 260-day calendar made up of a day from one to 13 and 20 day names.