Hi Cheryl, No, not relative as it pertains to our everyday conception of it here. If we lived on the Moon (as I think the PANs and Homer Simpsons of BadAstronomy do), and we had the same discussion of Moon-centric or Sun-centric cosmology, then the PANs and Homer Simpsons of BadAstronomy would need to invent certain motions of the Moon to account for the "equivalence" of the two systems. These would not be the same as those that they are defending with respect to the World. This is true because there exist in the universe more than just two objects. Neville. "Cheryl B." <c.battles@xxxxxxxxxxx> wrote: Neville -- Are you saying that there is any reason to think that what we would expect to see from the moon as it pertains to the earth turning is relative? Cheryl --------------------------------- ALL-NEW Yahoo! Messenger - all new features - even more fun!