Origins of the word "revolution"

Revolution has had many meanings since its inception. It comes from the Latin revolutionem which means, "a revolving." First it was used to describe celestial bodies. From about 1450 it was used to mean in general use "instance of great change in affairs." It gained a political meaning in 1600 from the French. It was first used as a noun (revolutionary) in 1850, from the world revolutionize, which means "to change a thing completely and fundamentally."

http://www.etymonline.com/index.php?term=revolution

In class we were talking about how revolve means to come back to where one started. I think this line of thought corresponds to the celestial body definition.