Considering the changes in orbital speed when a planet moves closer to or farther from the Sun, The planet's speed is faster at the aphelion than at the perihelion. A planet moves faster when it is closest to the Sun. The planet's speed is not influenced by its distance from the Sun. A planet moves slower when it is farthest from the Sun.

The correct statements regarding the changes in orbital speed when a planet moves closer to or farther from the Sun are:<br /><br />1. A planet moves faster when it is closest to the Sun.<br />2. A planet moves slower when it is farthest from the Sun.<br /><br />These statements are based on Kepler's Second Law of Planetary Motion, which states that a line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. This implies that a planet travels faster when it is near perihelion (closest point to the Sun) and slower when it is near aphelion (farthest point from the Sun).