In a non-linear setting, the book examines the movement around the center of mass of unguided aircraft in the passive section of the trajectory: mainly when entering the atmosphere, as well as when moving in the atmosphere and when leaving the atmosphere. The study proposes: an asymptotic method applicable in cases where the characteristic time of movement of the aircraft around the center of mass is much less than the characteristic time of movement of the center of mass, and a refined asymptotic method based on the conjugation of numerical and asymptotic solutions of the equations of motion, which has a much wider scope. In addition, the book contains well-known analytical solutions for the case of movement of an aircraft with small angles of attack.