Show ancient time measurement records at the casa grande rulus in I 1 a arizona disclose that a perfect system of time measurement was in use thousands of years yeara ago once byear a year at exactly the moment the earth has completed its orbit around the sun the rays of the sun beam through the marking definitely the beginning ot or end of a year the ho was the calendar used by the prehistoric peoples who occupied the ruins it la Is thought smaller divisions of time were marked by new moons moona |