There are several explanations for why the circle is divided into 360 parts. Probably the best explanation is connected with the Babylonians (巴比伦人).
     Many, many centuries ago, large distances were measured in the Babylonia mile. The Babylonian mile equaled about seven of our miles.（约合11公里） Because of its length, the time needed to travel the Babylonia became a measure of time. One day was said to be twelve Babylonian time-miles.