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Calendrical Calculations, Third Edition by Edward M. Reingold, Nachum Dershowitz

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        Geometrical explanation of the planetary distances—the mystical harmony of the spheres. From Johannes Kepler’s Prodromus Dissertationum Cosmographicarum Continens Mysterium Cosmographicum (1596). (Courtesy of the University of Illinois, Urbana, IL.)

13Time and Astronomy

Ask my friend I’Abbé Sallier to recommend to you some meagre philomath, to teach you a little geometry and astronomy; not enough to absorb your attention, and puzzle your intellects, but only enough, not to be grossly ignorant of either. I have of late been a sort of an astronome malgré moy, by bringing last Monday, into the house of Lords, a bill for reforming our present ...

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