Aztec Calendar

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Aztec calendar stone

 
 

 
 
Tonalamatl 260-day calendar. Divided into 20 periods of
13 days, called Trecenas. This Trecena 14 was governed
by Xipe Totec and Quetzalcoatl. Each day panel has a
Lord of the Day, a Lord of the Night, and an augural bird.