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their movements. In the third edition of the Principia, Newton employed his micrometrical measures of Jupiter's disc, of Saturn's disc and ring, and of the elongations of their satellites; and obtained from him data for correcting the places of the comet of 1680. Laplace also used Pound's observations of Jupiter's satellites to determine the planet's mass, and Pound himself compiled in 1719 a set of tables for the first satellite, into which he introduced an equation for

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