The terms "rotation" and "revolution" are used to describe different types of motion exhibited by celestial bodies like planets. Here's the difference between the two:
Rotation Speed: Rotation refers to the spinning motion of a planet around its own axis. The rotation speed, also known as the rotational velocity or angular velocity, represents how quickly a planet completes a full rotation on its axis. It is typically measured in terms of the time taken to complete one rotation, often expressed in hours, minutes, or seconds. For example, Earth takes approximately 24 hours to complete one full rotation, resulting in a rotation speed of about 1,040 miles per hour (1,670 kilometers per hour) at the equator.
Revolution Speed: Revolution, on the other hand, refers to the orbital motion of a planet around a star, such as the Sun. The revolution speed, also called the orbital velocity or orbital speed, represents how fast a planet travels along its orbit around the star. It is typically measured in terms of distance traveled per unit of time, often expressed in kilometers per second or miles per hour. For instance, Earth orbits the Sun at an average speed of about 67,000 miles per hour (107,000 kilometers per hour).
To summarize, rotation speed refers to the spinning motion of a planet around its axis, while revolution speed refers to the orbital motion of a planet around a star.