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Mesoamerican Mathematics and Calendrics Tim Roufs University of Minnesota Duluth •• • • 5 5 5 1 1 1 1 14 Cuello, Belize Cuello, Belize Maya Mathematics •••• 5 5 1 1 1 1 14 Understanding Physical Anthropology and Archaeology, 8th ed., p. 487. Maya Mathematics Understanding Physical Anthropology and Archaeology, 8th ed., p. 487. Gregorian Calendar • followed the Julian Calendar which had been used 800 years • in 1582 Pope Gregory XIII declared that the following October 4th should be October 15th • he also provided that leap years should be skipped in centesimal years, except when they are divisible by 4 • thus, there were no leap years in 1700, 1800, 1900, but there was one in 2000 Mathematics Mathematics Mathematics Duluth Herald Tribune Saturday, February 1, 2003, p. 2A End of Mathematics and Calendrics