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  2. Mesoamerican Long Count calendar - Wikipedia

    en.wikipedia.org/wiki/Mesoamerican_Long_Count...

    Rather than using a base 10 scheme, the Long Count days were tallied in a modified base-20 scheme. In a pure base 20 scheme, 0.0.0.1.5 is equal to 25 and 0.0.0.2.0 is equal to 40. The Long Count is not pure base-20, however, since the second digit from the right (and only that digit) rolls over to zero when it reaches 18.

  3. Maya calendar - Wikipedia

    en.wikipedia.org/wiki/Maya_calendar

    The Long Count calendar identifies a date by counting the number of days from the Mayan creation date 4 Ahaw, 8 Kumkʼu (August 11, 3114 BC in the proleptic Gregorian calendar or September 6 in the Julian calendar-3113 astronomical dating). But instead of using a base-10 scheme, the Long Count days were tallied in a modified base-20 scheme ...

  4. Baktun - Wikipedia

    en.wikipedia.org/wiki/Baktun

    The Classic period of Maya civilization occurred during the 8th and 9th baktuns of the current calendrical cycle. The current baktun started on 13.0.0.0.0 – December 21, 2012 using the GMT correlation. Archaeologist J. Eric S. Thompson stated that it is erroneous to say that a Long Count date of, for example, 9.15.10.0.0 is in the “9th ...

  5. Scientists Finally Solved the Mystery of How the Mayan ...

    www.aol.com/scientists-finally-solved-mystery...

    The Mayan calendar’s 819-day cycle has confounded scholars for decades, but new research shows how it matches up to planetary cycles over a 45-year span.

  6. Mesoamerican calendars - Wikipedia

    en.wikipedia.org/wiki/Mesoamerican_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.

  7. Maya numerals - Wikipedia

    en.wikipedia.org/wiki/Maya_numerals

    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.

  8. Aztec calendar - Wikipedia

    en.wikipedia.org/wiki/Aztec_calendar

    Jaguar, 2. Eagle, and so on, as the days immediately following 13. Reed. This cycle of number and day signs would continue similarly until the 20th week, which would start on 1. Rabbit, and end on 13. Flower. It would take a full 260 days (13×20) for the two cycles (of twenty day signs, and thirteen numbers) to realign and repeat the sequence ...

  9. Kʼatun - Wikipedia

    en.wikipedia.org/wiki/Kʼatun

    A kʼatun (/ ˈ k ɑː t uː n /, [1] Mayan pronunciation:) is a unit of time in the Maya calendar equal to 20 tuns or 7200 days, equivalent to 19.713 tropical years. 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.