The discussion centers around finding advanced textbooks on satellite navigation and celestial mechanics, specifically focusing on Newtonian and relativistic orbital motion. Participants clarify the initial confusion between satellite navigation and orbital mechanics, emphasizing the need for sophisticated resources beyond introductory texts. Recommendations include "Fundamentals of Astrodynamics" by Bate, Mueller, and White for classical theory, and "Fundamentals of Astrodynamics and Applications" by David Vallado for a more comprehensive approach. Additionally, there is interest in using MATLAB for simulating particle orbits under Kepler's laws and Schwarzschild geometry, with suggestions to explore numerical integration methods for orbit simulations. The conversation highlights the importance of celestial mechanics in understanding satellite motion despite its perceived decline in interest.