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  1. Memoir of the secular variations of the elements of the orbits of the eight principal planets, Mercury, Venus, the Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; with tables of the same; together with the obliquinity of the ecliptic, and the precession of the equinoxes in both longitude and right ascension.
    By: Stockwell, John N.
    Publication info: Washington,Smithsonian Institution,1872
    Contributed by: University of California Libraries (archive.org)
    Subjects: 19th century  Astronomy  Orbits  
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  2. Theory of the motion of the heavenly bodies moving about the sun in conic sections a translation of Gauss's "Theoria motus." With an appendix. By Charles Henry Davis
    By: Gauss, Carl Friedrich, - Davis, Charles Henry, - Making of America Project
    Publication info: Boston,Little, Brown and company,1857
    Contributed by: University of California Libraries (archive.org)
    Subjects: Online resources  Orbits  
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