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"For the reader resolved to eschew theory and admit only definite observational facts, all astronomical books are banned. There are no purely observational facts about the heavenly bodies. Astronomical measurements are, without exception, measurements ofphenomena occuring in a terrestrial observatory or station; it is only by theory that they are translated into knowledge of a universe outside." -Sir Arthur Eddington; The Expanding Universe, p.17 2/7/2003 11:40:56 PM  

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