A baktun (properly bʼakʼtun ) is 20 '' kʼatun'' cycles of the ancient Maya Long Count Calendar. It contains 144,000 days, equal to 394.26

tropical year A tropical year or solar year (or tropical period) is the time that the Sun takes to return to the same position in the sky – as viewed from the Earth or another celestial body of the Solar System – thus completing a full cycle of astronom ...

s. The Classic period of

Maya civilization 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 writin ...

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 baktun”, analogous to describing the year 209 AD as in the “2nd century AD”. Even so, the practice is so well established among Maya

epigraphers Epigraphy () is the study of inscriptions, or epigraphs, as writing; it is the science of identifying graphemes, clarifying their meanings, classifying their uses according to dates and cultural contexts, and drawing conclusions about the wr ...

and other students of the Maya, that to change it would cause more harm than its perpetuation. The current practice of referring to the current baktun as ”baktun 13” or “thirteenth baktun” may stand, even though it is properly the fourteenth baktun. Alternatively, the first baktun could instead be referred to as the 0th or null to avoid this ambiguity.

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