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Thanks Scott Mayers, It seems to me that a "simple linear perspective", as you put it, is all we can see from Earth.We look at the night-sky, and see galaxies apparently moving apart from each other. Actually, we don't even see that. What we see is displacements of lines in spectroscopes, the "red-shift", and assume it's caused by the galaxies moving. Whether that assumption is correct who can say. I wouldn't bank on it.Couldn't someone just as well argue, that because we see a displacement of the Sun in the sky, from rising in the East to setting in the West, this is caused by the Sun moving round the Earth.