People in Mesopotamia civilization has significant achievements in science. They were advanced in astronomy. They knew to calculate the time of rising and setting of sun and moon. They divided the day into 24 hours, minute in 60 seconds and an hour of 60 minutes. They started dividing circle of geometiy in (360°) degrees. Mehrabs (Arch) was invented by them. It was a greatest achievement of architecture as it could hold heavy weights and looked attractive.
