How fast does the Earth rotate?

One rotation of the Earth takes one day. If at 12noon the sun is at the nighest 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 24hours.they could have counted the hours from 1to10 , then to 20 ,and so on, but instead they calculated from 1to 60,then 120,and so on, For this reason.,time is divided into parts of 60

one day has 24 hours, I.e.,4×6hours.