Quote:
Originally Posted by Nesti
what matters is what is seen from the perspective of the Moon itself...the Moon sees a reoccurring and revolving sky pattern. That is spin.
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Not really. You get the same effect driving a car around and around a roundabout. Re-occurring and revolving scenery, the car always presents the same side to the centre of the roundabout - but the car is not spinning on its axis. It has forward, but curved motion.
Imagine this - the olympic sport of hammer throw. Big heavy person swinging a ball on the end of a chain. Once it gets up to speed they rotate around their common centre of mass. The ball always presents the same face to the thrower, but it is not spinning on its axis. A tiny observer sitting on the ball's surface would get revolving/re-occurring scenery.