Baktun
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A Baktun is 20 Katun cycles of the ancient Maya Long Count Calendar. It contains 144,000 days or nearly 400 years. The Classic period of Maya civilization occured during the 8th and 9th Baktuns of the current calendrical cycle. The current (12th) baktun is believed to end on December 20, 2012. The 13th Baktun (13.0.0.0.0 in Long Count notation) will then begin on December 21, 2012.