POINCARÉ, Leçons de Mécanique Céleste, 1905-1910

First edition.
Henri Poincaré (1854-1912), a member of the Institute and professor at the Faculty of Sciences of Paris, was one of the greatest mathematicians and physicists of his time, making fundamental contributions to many fields. His Leçons de Mécanique Céleste (Lessons on Celestial Mechanics) is a masterpiece that explores the dynamics of celestial bodies, particularly the theory of planetary perturbations, a central topic for understanding the stability of the solar system.