Why Is a Circle 360 Degrees?

Wow and Flutter/CC-BY-2.0

It was the Babylonians who first divided the circle into 360 degrees in order to integrate the geometry they developed with the 360-day calendar then in use. The Babylonians devised a counting system based not on units of 10 but on units of 60, which can be counted to on the 12 knuckles of one hand and the five fingers of the other.