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Original Articles

Galileo on the moons of Jupiter

Pages 165-169 | Published online: 22 Aug 2006

  • Galileo . 1957 . “ The Starry Messenger ” . In Discoveries and Opinions of Galileo Edited by: Drake , S. 21 – 24 . Garden City
  • Galileo . 1957 . “ The Starry Messenger ” . In Discoveries and Opinions of Galileo Edited by: Drake , S. 57 – 57 . Garden City The Latin, for those who would like to check Drake's translation, is as follows: ‘Eximium praeterea praeclarumque habemus argumentum pro scrupulo ab illis demendo, qui in Systemate Copernicano conversionem Planetarum circa Solem aequo animo ferentes, adeo perturbantur ab unius Lunae circa Terram latione, interea dum ambo annum orbem circa Solem absolvunt, ut hanc universi constitutionem, tanquam impossibilem, evertendam esse arbitrentur: nune enim, nedum Planetam unum circa alium convertibilem habemus, dum ambo magnum circa Solem perlustrant orbem, verum quatuor circa Iovem, instar Lunae circa Tellurem, sensus nobis vagantes offert Stellas, dum omnes simul cum Iove, 12 annorum spatio, magnum circa Solem permeant orbem’. Galileo, Le Opere, Edizione nazionale, 1929–1939, vol. iii, Pt. I, p. 95.
  • Cohen , I. Bernard . 1960 . The Birth of a New Physics 80 – 81 . Garden City
  • Kuhn , Thomas S. 1959 . The Copernican Revolution 222 – 222 . New York
  • Holton , Gerald . 1956 . Introduction to Concepts and Theories in Physical Science 161 – 161 . Reading, Mass.
  • The first comparison of Jupiter and its moons to the solar system was apparently made by Wackher. Kepler says, ‘A further consequence was very brilliantly pointed out by Wackher. Like our earth, Jupiter also rotates about its axis. That rotation is accompanied by the revolution of the four moons, just as the rotation of our earth is accompanied by the revolution of our moon in the same direction. Therefore Wackher now finally accepts the magnetic principles by which, in my recent “Commentary on Celestial Physics,” I explained that the motions of the planets are caused by the rotation of the sun about its axis and poles’ Kepler's Conversation with Galileo's Sidereal Messenger Rosen Edward Johnson Reprint New York 1965 42 42 Note that Kepler introduces this as a further consequence and that Wackher's acceptance of Kepler's views about the solar system follows directly from a comparison of Jupiter and the earth.
  • Cohen . 1960 . The Birth of a New Physics 87 – 88 . Garden City see Kuhn, op. cit., p. 222; Holton, op. cit., p. 161.
  • Galileo . 1967 . Dialogue Concerning the Two Chief World Systems Edited by: Drake , S. 335 – 335 . Berkeley 337 respectively, my italies.
  • Drake , S. , ed. 1967 . Dialogue Concerning the Two Chief World Systems 339 – 340 . Berkeley my italies

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