The Aztec Sun Stone (also known as the Calendar Stone) is a representation of the five eras of the sun from Aztec mythology. The stone was part of the architectural complex of the Temple Mayor of Tenochtitlán and dates to c. 1427 CE. The basalt stone measures 3.58 metres in diameter, is 98 centimetres thick and weighs 25 tons. (National Museum of Anthropology, Mexico City).
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