A Thousand Pardons wrote:
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The reference frame is that attached and fixed to the body. Since the body is not moving in that reference frame, there is no centrifugal force.
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The body under consideration is the earth. In that reference frame the earth does not rotate and is not subject to centrifugal force. What force, in that reference frame, causes the earth’s equatorial bulge? If the reference frame were the sun, what would cause the spectrographic shifts we observe at the limbs of the sun? If the reference frame were a star exhibiting spectrographic line widening, what would cause the spectrographic line widening we observe for that star?
RichardMB: I will respond to your post later.