Calendar Stone
The monolith of the Stone of the Sun, also known as the Aztec calendar stone (National Museum of Anthropology and History, Mexico City).
Source
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"1024px-1479_Stein_der_f%C3%BCnften_Sonne%2C_sog._Aztekenkalender%2C_Ollin_Tonatiuh_anagoria.JPG."
https://en.wikipedia.org/wiki/Aztec_calendar_stone#/media/File:1479_Stein_der_f%C3%BCnften_Sonne,_sog._Aztekenkalender,_Ollin_Tonatiuh_anagoria.JPG
Wikipedia
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