Um, I pretty sure the author doesn't remember much from his physics classes. Rotation and revolution are two separate concepts. He seems to explain that spin and revolution are two types of rotation, but that is just plain wrong.
@Cursed_death You are right. The author should have said that rotation is a type of revolution instead of saying that revolution is a type of rotation.
@tsuu I don't think so. The raws are at 132 I believe so we are far, far, far behind. We probably will never catch up considering we get like 1 chapter every 1~2 months