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Quote: But in the modern theory the question between Copernicus and earlier astronomers is merely one of convenience all motion is relative, and there is no difference between the two statements 'the earth rotates once a day' and 'the heavens revolve about the earth once a day' The two mean exactly the same thing, just as it means the same thing if I say that a certain length is six feet or two yards. Astronomy is easier if we take the sun as fixed than if we take the earth, just as accounts are easier in decimal coinage But to say more for Copernicus is to assume absolute motion, which is a fiction All motion is relative, and it is a mere convention to take one body as at rest All such conventions are equally legitimate, though not all are equally convenient. ABC of Relativity Bertrand Russell