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How did Jonathan Swift predict mars moon speeds?

  1. Jun 24, 2009 #1
    In Gulliver's Travels Jonathan Swift described the two moons of Mars, Phobos and Deimos, giving their exact size and speeds of rotation. He did this more than 100 years before either moon was discovered.

    granted this is true - how would one even predict such a thing?
     
  2. jcsd
  3. Jun 24, 2009 #2

    mgb_phys

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