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”Johannes Kepler” (original in Strassburg).]
                                            It has seemed to many that Plato’s de-
                                         mand for uniform circular motion (linear or
                                         angular) was responsible for a loss to as-
                                         tronomy of good work during fifteen hun-
                                         dred years, for a hundred ill-considered spec-
                                         ulative cosmogonies, for dissatisfaction, amount-
                                                                ˜
                                         ing to disgust, with these A priori guesses,
                                         and for the relegation of the science to less
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