What term describes the spinning motion of a planet on its axis?

• A. Seasons
• B. Revolution
• C. Lunar Eclipse
• D. Rotation

Answer: (D)

Spinning motion around a planet’s own axis is called rotation. Think about how Earth turns like a spinning top; as it rotates, different parts face the Sun, creating day and night. That spinning takes about 24 hours to complete, which is what we call a day.

This is different from revolution, which is moving around another object—in Earth’s case, orbiting the Sun, which takes about a year and underlies the changing seasons when you combine it with the tilt of the planet. A lunar eclipse is a specific event that happens when the Moon passes through Earth’s shadow, not about spinning. Seasons describe yearly weather patterns resulting from tilt and orbital position, not the planet’s spin itself.

Rotation is the best term here because it directly describes the planet's spin about its own axis.