Interviews with archaeologists provide an explanation of Cahokia’s urban layout and the similarities to the celestial blueprint of Teotihuacan. These archaeologists discovered Cahokia’s “Woodhenge,” a ring of cedar posts that acts as a solar calendar to determine when to plant and harvest and gather for ceremonies. The people of Cahokia considered the area a sacred space. Like the sun pyramid in Teotihuacan, the location of Woodhenge is precisely aligned with the sun’s movements.