The Aztec calendar stone, Mexica sun stone, Stone of the Sun (Spanish: Piedra del Sol), or Stone of the Five Eras, is a large
monolithic sculpture that was excavated in the Zócalo, the main square of Mexico City, on December 17, 1790. It was discovered
while Mexico City Cathedral was being repaired. The stone is approximately 12 feet (3.7 m) across and weighs approximately 24
tons. The exact purpose and meaning of the stone is unclear. Archaeologists and historians have proposed a number of theories,
however, and it seems likely that there are many aspects to the stone.
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