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Note on the ancient Mexican calendar system

1519 to 1522 and Aztec equivalents

Reconstruction, by Zelia Nuttall

The Aztecs used a 260-day divinatory calendar that they called the tonalpoualli.  They named each year for the tonalpoualli date on which it began.  The Aztec day names and the Aztec date notations were simpler than those of the Maya. 

 
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