The Calmecac was a residence hall for priests and a school for future priests, administrators and politicians, where they studied theology, literature, history and astronomy. Its exact location is on one side of what is now Donceles Street. The Temple of Quetzalcoatl was located to the west of the Templo Mayor. It is said that during the equinox, the sun rose between the shrines dedicated to Huitzilopochtli and Tlaloc and shone directly on this temple. Due to the god's serpentine nature, the temple had a circular base instead of a rectangular one.