The Aztec calendar is as much a fascination today as it was when the Spainish arrived in the 16th century. 

Task
From whom is it surmised that Aztecs gathered their initial calendar-making skills?
How did each of the four previous eras prior to the coming of Cortez come to an end?
Did Aztecs fear an end coming that might be similar to the other eras? What were they trying to do to forestall it?

Link
Aztec Calendar

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