Epitome of Copernican Astronomy: & Harmonies of the WorldThe 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. This volume contains two of his most important works: The Epitome of Copernican Astronomy (books 4 and 5 of which are translated here) is a textbook of Copernican science, remarkable for the prominence given to physical astronomy and for the extension to the Jovian system of the laws recently discovered to regulate the motions of the Planets. Harmonies of the World (book 5 of which is translated here) expounds an elaborate system of celestial harmonies depending on the varying velocities of the planets. |
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ON THE REAL AND TRUE | 88 |
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according Accordingly ancient angle anomaly aphelial movement aphelion apparent approximately apsides argument astronomy axis beginning body Book called cause celestial centre Chapter circle common concerning consonances cube delays demonstrated diameter diesis distance drawn Earth eccentric ecliptic ellipse equal example extreme figures finally five fixed stars follows force give given globe greater greatest harmonic heavens intervals irregularity Jupiter latitude least less libration light limits lower magnitude major Mars matter mean measure ment Mercury mind minor mode moon motor move namely natural nevertheless octave orbit perfect perihelial movement periodic physical planet planetary position primary proportion Proposition ratio reason region regular remaining respect revolve Saturn scale semidiameter side simple sine single smaller solid sphere square surface taken terrestrial tetrahedron things third threads triangle true turn Venus virtue whole