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Today in History: December 17

Slide 1 of 14: MEXICO - JUNE 01:  Aztec Low Relief, Calendar Or Sun Stone, Dating From The Late Postclassic Period (1300-1521). Preserved At The National Museum Of Anthropology In Mexico (Diameter 3M60).This 20 Ton Monolith Is A "Monument To The Calendar". The Aztec Calendar Was Founded On A Two-Year Cycle. One Solar, Of 360 Days (+ 5 Neutral Days); The Other Divinatory, With 260 Days (Following The Combination Of 20 Day And Number Signs : 1 To 13). Added To This Was The Year Of Venus, With 584 Solar Days.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)

1790: Aztec calendar stone is discovered

The Sun Stone also known as the Aztec calendar stone is re-discovered during repairs on the Mexico City Cathedral. It remained mounted on the exterior wall of the cathedral where it remained until 1885.

© Keystone-France/Gamma-Keystone/Getty Images
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