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Correlation:
Some discussion exists on how to correlate the Aztec calendar to our common datesystem.
From an historical perspective, the most supported correlation is the one suggested by Alfonso Caso. An anchor for this correlation is the recorded date of 1-Coatl for August 13, 1521 Julian (the fall of the city of Tenochtitlan). Most other mesoamerican calendars use a similar day count as presented by this correlation.
The correlation can also be set to the one of Francisco Rodriguez Cortes. Francisco is a current day calendrist who lives in Chiapas, Mexico.