A Baktun is a unit of time in the Mesoamerican Long Count calendar, primarily used by the Maya civilization, and it consists of 144,000 days, or approximately 394.26 solar years. The completion of a Baktun was significant in Maya culture, often associated with ceremonial events and mythological cycles, with the most famous being the end of the 13th Baktun on December 21, 2012, which was widely misinterpreted as a prediction for the end of the world.