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Published online by Cambridge University Press: 20 January 2017
The Mexican ("Aztec") 365-day calendar and the Western Maya (Yucatec) 365 day calendar in use at the time of the Spanish conquests of Mexico and the Yucatan have an invariable relation to each other. The first nine mesomonths (named 20-day intervals) of the Yucatec 365-day calendar are coterminous with the last nine mesomonths of the "Aztec" calendar. The proof reconfirms the validity of the modified Thompson (584,283) correlation between Mesoamerican and European calendars.