and sunsets and also toward the rising point of the three brightest stars that rise before the sun in the summer. About fifty medicine wheels have been discovered, several are thousands of years. Many of them have the same alignment as the Bighorn Medicine Wheel. In Chaco Canyon, New Mexico two spirals carved into the rock by the prehistoric Anasazi can be used as a calendar. A dagger of light penetrates the shadow of adjacent rocks. The dagger moves with the sun to different locations on the spiral.the full pattern also reflects the 18.6 year cycle of the moon as well as the yearly cycle of the sun. The ancient Native Americans were not sophisticated astronomers in the sense of coherent theory behind the movements of heavenly objects, their level of understanding of the time cycles of the sun, moon and planets was great. The methods for recording and keeping track of the seasonal movements was clever and displays a cultural richness that varies from tribe to tribe....
