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Planetary theory is a book category centered on the scientific and mathematical frameworks that describe how planets and planetary systems form, evolve, and move. Works in this area cover celestial mechanics and orbital dynamics—such as gravitational perturbations, resonances, N-body interactions, stability and chaos—as well as models of planet formation and migration and the architectures of exoplanet systems. The category spans analytical theory, numerical simulation, and statistical inference, and often traces the field’s development from Ptolemy, Copernicus, Kepler, and Newton to modern astrophysics. Applications include ephemeris construction, spacecraft navigation, and methods for detecting and characterizing exoplanets. While overlapping with planetary science, which treats planetary surfaces and atmospheres, planetary theory focuses primarily on dynamical and theoretical foundations.

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