"1834" . "Satellites" . . "Gravitation, an elementary explanation of the principal perturbations in the solar system" . . . "Plan\u00E8tes" . "Planets" . "Perturbation" . . "Gravitation, an elementary explanation of the principal perturbations in the solar system" . . . . . . "Lune, Th\u00E9orie de la" . "Perturbation (astronomie)" . . "Text" . "Lunar theory" .