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Old 05 February 2007, 02:37 PM
Traveler in Black
 
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Strictly speaking, don't the Earth and the Moon both revolve around their barycenter?

There's a logic problem that asks: if a squirrel is going around a tree, and an observer is circling the tree at a rate such that the tree is always interposed between the observer and the squirrel, does the observer go around the squirrel or not?

There's also a classic SF story that extends this principle to a stranded astronaut on an asteroid and the hostile ship that's searching for him, but I can't seem to recall the title or the author.
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