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Jim,
I imagine this oceanography professor didn't learn or doesn't remember that
scientists should always avoid ambiguous language. I even know some
physicists who are not always careful to speak and write clearly and
unambiguously.
This chap was obviously thinking about the Earth-moon system revolving about
its CM and forgot that both bodies also rotate. His statements are loosely
correct for such a system.
Go easy on him.
Paul O. Johnson