No they didn't "reveal" it. They arbitrarily divided a circle in 360 parts. Why Base 60? Maybe because it "can be subdivided using 60, 30, 15, 12, etc., all fractions of the root number." Duh. Much less hassle dealing with fractions than Base 10.
I love the wide-eyed wonderment of people who confuse reality (such as a circle) with convention (360 degrees.)