A massive Aztec Coyolxauhqui stone, discovered in 1978, reveals moon goddess. Its monumental size and ancient carvings inspire questions about Aztec history. On February 21, 1978, electrical workers in Mexico City made a discovery that changed history. Buried beneath the streets was the Coyolxauhqui Stone, a massive 11-foot (3.4m) diameter disc depicting the Aztec moon goddess, dismembered and decapitated. Created around 1473, the stone tells the myth of Coyolxauhqui's defeat by her brother, the