Orbital mechanics is the branch of astrodynamics that focuses on the motion of objects in space, particularly the interactions between celestial bodies such as planets, moons, and spacecraft. This field of study involves the calculation and prediction of orbits, trajectories, and maneuvers of objects in space, as well as the effects of gravitational forces, momentum, and other physical phenomena on their motion. Orbital mechanics is essential for spacecraft navigation, mission planning, and satellite communication, and has applications in astronomy, physics, and engineering. Some key concepts in orbital mechanics include Kepler's laws of planetary motion, Newton's laws of motion, and the calculation of orbital elements such as eccentricity, inclination, and period.