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Perhaps inspired by Johannes Kepler ( and quoting Kepler's third law ), Swift's satire Gulliver's Travels refers to two moons in Part 3, Chapter 3 ( the " Voyage to Laputa "), in which the astronomers of Laputa are described as having discovered two satellites of Mars orbiting at distances of 3 and 5 Martian diameters, and periods of 10 and 21. 5 hours, respectively.

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Perhaps inspired by Johannes Kepler ( and quoting Kepler's third law of planetary motion ), Jonathan Swift's satire Gulliver's Travels ( 1726 ) refers to two moons in Part 3, Chapter 3 ( the " Voyage to Laputa "), in which Laputa's astronomers are described as having discovered two satellites of Mars orbiting at distances of 3 and 5 Martian diameters, and periods of 10 and 21. 5 hours, respectively.

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