Why does the outer layer of the sun have differential rotation? I don't feel that way myself but some might find it really strange and wierd that it has differential rotation and feel that it's a contradiction. They may say &quot;How is it possible?&quot; I am asking on behalf of others who might have that question what assumptions they are making and how to break them.
I think they're not taking into account the Coriolis force in the frame of reference of the part of the outer layer of the sun at each latitude. I can't quite think of a proof that the outer layer of the sun would be predicted to have differential rotation. However, when you realize about the Coriolis force acting on the convection currents, you see that it does not give you a proof that there shouldn't be differential rotation. Maybe the part at one latitude then exerts a force on the part at an adjacent latitude until the rates of the two layers satisfy a certain equation.