October
14
/ 2025
A massive, 205-foot (62.5-meter) scorpion-shaped mound discovered in Mexico's Tehuacán Valley may have served as an astronomical observatory for ancient farmers, challenging long-held beliefs about who controlled celestial knowledge in pre-Hispanic Mesoamerica. The rare effigy mound, built between AD 600 and 1100, appears to align precisely with both the summer and winter solstices, suggesting that ordinary countryside farmers possessed sophisticated astronomical understanding independent of elite priestly classes. Ancient Observatory in the Valley The scorpion effigy is one of twelve mounds forming a civic and ceremonial complex spanning approximately 22 acres in the Tehuacán Valley, located about 160 miles (258 km) southeast of Mexico City. Archaeologists from the University of Texas at Austin first documented the site in 2014 while surveying
