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Published online by Cambridge University Press: 25 January 2017
The natives of Yucatan employed successively three different chronological systems that had Maya nomenclature. These systems will be designated in the order of their appearance: the old Maya calendar, distinguished by a long count; the Mexicanized calendar, distinguished by a shift in the month coefficients; and the Europeanized calendar, distinguished by the fixation of 10 Chen on January 1 and of 1 Pop on July 16.
The old Maya calendar is a system with an ascending order of units based on twenty, except the tun where eighteen is used. The value of each order is expressed by a coefficient that may range from zero to nineteen, excepting the uinal where the range is from zero to seventeen.