Although you might not expect it, we need to answer another question first.
Why are there 60 seconds in a minute & 60 minutes in an hour?
The origin of 60 seconds per minute, 60 minutes per hour and 360 degrees per circle has to do with the Babylonians. For beginners they used 60 as their base number instead of 10. You see we take something for granted and that is: we are using base 10, but not everybody is/was.