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  2. Mesoamerican Long Count calendar - Wikipedia

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

    Maya numerals. Long Count dates are written with Mesoamerican numerals, as shown on this table. A dot represents 1 while a bar equals 5. The shell glyph was used to represent the zero concept. The Long Count calendar required the use of zero as a place-holder and presents one of the earliest uses of the zero concept in history.

  3. Maya calendar - Wikipedia

    en.wikipedia.org/wiki/Maya_calendar

    The Maya calendar consists of several cycles or counts of different lengths. The 260-day count is known to scholars as the Tzolkin, or Tzolkʼin. [5] The Tzolkin was combined with a 365-day vague solar year known as the Haabʼ to form a synchronized cycle lasting for 52 Haabʼ called the Calendar Round.

  4. Baktun - Wikipedia

    en.wikipedia.org/wiki/Baktun

    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.

  5. 2012 phenomenon - Wikipedia

    en.wikipedia.org/wiki/2012_phenomenon

    In the Maya Long Count, the previous world ended after 13 bʼakʼtuns, or roughly 5,125 years. [23] [a] The Long Count's "zero date" [b] [c] was set at a point in the past marking the end of the third world and the beginning of the current one, which corresponds to 11 August 3114 BC in the proleptic Gregorian calendar.

  6. Mesoamerican calendars - Wikipedia

    en.wikipedia.org/wiki/Mesoamerican_calendars

    The post-Classic Maya used an abbreviated short count. Many Maya Long Count inscriptions also have a supplementary series which can record which one of the nine Lords of the Night rules, a Lunar series which has information about the lunar cycle, such as lunar phase and position of the Moon in a six lunation cycle and length of the current ...

  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. The 6 most common headache types — and when to see a doctor

    www.aol.com/6-most-common-headache-types...

    Headaches are one of the most common medical conditions, with 96% of people having at least one in their lifetime, according to Cleveland Clinic. About 40% of people globally experience what are ...

  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.