[RadioAstronomer]

Actually, the centrifugal force associated with the Sun rotating around the Earth would be HUGH! Even Einstein can't help you here. Newton had the Earth and Sun rotating around their common center of Gravity.

I hate the term "centrifugal force". There is no such thing. For example, what you "feel" (being forced towared the outside of the turn) as a car is rounding a curve and what is described as centrifugal force, is nothing more than your mass trying to continue in a strait line. (see Newtons three laws). The real force is actually in the directon towards the turn (center) and is called centripetal force.

[Lonesome in Massachussets]

I agree, I was trying to give a concise answer. BTW, since you're a radio astronomer, what's the "fourth test of General Relativity" and to whom is it credited? Hint: I have Radar Astronomy (Evans and Hagfors) sitting here on my desk.