Prograde means rotating in the same direction in which most of the planets in our solar system rotate, which is counterclockwise, and retrograde rotation means the opposite, i.e., clockwise rotation. I do not remember the source, but somewhere I had read that Sun continues shifting between prograde and retrograde rotation. The rotation will be prograde for a particular period of the interval; after that, it will be retrograde and then again prograde. I do not remember exactly where I had read this. But now, when I search on google if this is true, I am not getting any relevant information. Now I doubt whether this is indeed true or not. Can someone help me with this?
Note: I am talking about retrograde rotation, not retrograde orbit.