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Epitome of Copernican Astronomy and Harmonies of the World by Johannes Kepler (Paperback, 1996)
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£14.31
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The brilliant German mathematician Johannes Kepler (1571-1630), one of the founders of modern astronomy, revolutionized the Copernican heliocentric theory of the universe with his three laws of motion: that the planets move not in circular but elliptical orbits, that their speed is greatest when nearest the sun, and that the sun and planets form an integrated system.