One rotation of the Earth takes one day. If at 12 noon the sun is at the highest point in the sky, then after 24 hours it will come back again to the same position. It was the Babylonians who first divided the day into 24 hours. They could have counted the hours from 1 to 10, then to 20, and so on, but instead they calculated from 1 to 60, then to 120, and so on. For this reason, time is divided into parts of 60 (1 hour has 60 minutes, 1 minute has 60 seconds) or in parts of 6 (one day has 24 hours, i.e., 4 X 6 hours).
