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Countries that were part of the Maya civilization celebrated the end-date of a 5,126-year-long cycle in the Mesoamerican Long Count calendar.
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Maya civilization
Mesoamerican civilization (c. 2000 BC – 1697 AD)
The Maya civilization was a Mesoamerican civilization that existed from antiquity to the early modern period. It is known by its ancient temples and glyphs (script). The Maya script is the most sophisticated and highly developed writing system in the pre-Columbian Americas. The…Source: Wikipedia (CC BY-SA)
2012 phenomenon
Eschatological beliefs surrounding 21 December 2012
The 2012 phenomenon was a range of eschatological beliefs that cataclysmic or transformative events would occur on or around 21 December 2012. This date was regarded as the end-date of a 5,126-year-long cycle in the Mesoamerican Long Count calendar, and festivities took place on…Source: Wikipedia (CC BY-SA)
Mesoamerican Long Count calendar
Calendar used by several pre-Columbian Mesoamerican cultures
The Mesoamerican Long Count calendar is a non-repeating base-20 and base-18 calendar used by pre-Columbian Mesoamerican cultures, most notably the Maya. For this reason, it is often known as the Maya Long Count calendar. Using a modified vigesimal tally, the Long Count calendar…Source: Wikipedia (CC BY-SA)