"Orbital" refers to the path an object takes as it moves around another object in space due to gravitational forces. For example, the Earth orbits the Sun, while moons orbit their respective planets. This movement is governed by the laws of physics, particularly Newton's laws of motion and Kepler's laws of planetary motion. "Lunar" pertains to anything related to the Moon. The term is often used in contexts such as lunar phases, which describe the different appearances of the Moon as it orbits the Earth. The lunar surface features various geological formations, including craters and maria, which are large, dark plains formed by ancient volcanic activity.