Celestial motion refers to the movement of celestial bodies, such as planets, stars, and moons, in the universe. These movements are governed by the laws of physics, particularly gravity, which keeps these objects in orbit around larger bodies, like the Sun or Earth. The study of celestial motion helps scientists understand the structure and behavior of the universe. For example, the Kepler's laws of planetary motion describe how planets orbit in elliptical paths, while Newton's law of universal gravitation explains the forces acting between these bodies.