What term describes the movement of an object around another object?

• A. Revolution
• B. Rotation
• C. Seasons
• D. Phases of the Moon

Answer: (A)

Revolution describes the movement of one object around another. For example, Earth travels around the Sun once each year, and the Moon orbits Earth. This is different from rotation, which is when an object spins on its own axis—like Earth turning to produce day and night. Seasons are mainly caused by the tilt of Earth’s axis relative to its orbit, affecting how sunlight hits different parts of the planet, not the act of moving around another object. Phases of the Moon result from the changing geometry between the Sun, Moon, and Earth, not from the Moon simply circling Earth. So the term for movement around another object is revolution.