Homer Kelley (direct quote from recorded discussion):
"Centered Arc. There're some people arguing if it is the back of the neck or the head. I'll just touch on that. I advocate the head because, if you use that as your pivot center, your eyes will tell you when you have moved. You can see under the ball somewhere. Whereas, if you move your head with the back of the neck center, you have nothing there to go by. I don't think it's nearly as dependable. Geometrically, you could say it is more correct, but I have come to some information that says that it is not all that correct or effective either. So, you have to have a stationary Head."
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