Prograde motion refers to the movement of a celestial body in the same direction as the rotation of its parent body, such as a planet or star. For example, the planets in our solar system, including Earth, orbit the Sun in a prograde direction, which is counterclockwise when viewed from above the North Pole of the solar system. In contrast, retrograde motion occurs when a celestial body moves in the opposite direction of its parent body's rotation. Understanding prograde motion is essential for studying the orbits of planets, moons, and other celestial objects, as it helps astronomers predict their positions and movements in space.