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mathematically near the centre of the plan-
                                         etary system, but he did not appear to have
                                         any physical connexion with the planets as
                                         the centre of their motions.
                                            According to Copernicus’ sixth book, the
                                         planes of the planetary orbits do not pass
                                         through the sun, and the lines of apses do
                                         not pass through to the sun.
                                            Such was the theory advanced by Coper-
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