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First edition of Gauss's most important work in astronomy. It contains an analysis of the problems arising in the determination of the motions of planets and comets from limited observational data. "Gauss systematically developed the method of orbit calculation from three observations he had devised in 1801 to locate the planetoid Ceres, the earliest discovered of the 'asteroids', which had been spotted and lost by G. Piazzi in January 1801" (Norman). Very good copy.