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  2. Tzolkʼin - Wikipedia

    en.wikipedia.org/wiki/Tzolkʼin

    This is close to the average number of days between the first missed menstrual period and birth, unlike Naegele's rule which is 40 weeks (280 days) between the last menstrual period and birth. It is postulated that midwives originally developed the calendar to predict babies' expected birth dates. [16]

  3. Mesoamerican Long Count calendar - Wikipedia

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

    The five digit Long Count can therefore be confirmed with the other four characters (the "calendar round date"). Taking as an example a Calendar Round date of 9.12.2.0.16 (Long Count) 5 Kibʼ (Tzolkʼin) 14 Yaxkʼin (Haabʼ). One can check whether this date is correct by the following calculation.

  4. Mesoamerican calendars - Wikipedia

    en.wikipedia.org/wiki/Mesoamerican_calendars

    In the Maya area, calendar wheels depict a cycle of 13 K'atuns. The only known pre-Hispanic K'atuns wheel appears on a stone turtle from Mayapán. [20] The earliest known Colonial-period calendar wheel is actually depicted in a square format, on pages 21 and 22 of the Codex Borbonicus, an Aztec screenfold that divides the 52-year cycle into two ...

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

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    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 ... With a 780-day synodic period, 21 ...

  6. 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.

  7. 2012 phenomenon - Wikipedia

    en.wikipedia.org/wiki/2012_phenomenon

    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.

  8. 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.

  9. Women are being notified that they need to take action if ...

    www.aol.com/women-being-notified-action-dense...

    The Tyrer-Cuzik Model and the Black Women's Health Study (BWHS) Breast Cancer Risk Calculator also include race and ethnicity in the assessment. The BOADICEA calculates risk for breast and for ...

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