Sun deity of the Aztecs and Nahuas .
According to most myths, there were four eras that preceded the era of Tonatiuh, each of which ended by cataclysm. He was viewed as a god constantly threatened by the awesome tasks of his daily birth at sunrise, arduous journey across the sky, and death at each sunset. He was the object of human sacrifice, which was thought necessary to sustain him. Generally represented by a colorful disk, he was depicted in the center of the Aztec calendar, with his eagle's claw hands clutching human hearts.