the revolution of the sun around Earth the revolution of Earth around the sun the rotation of the sun around Earth the rotation of Earth around the sun
I gave my students this multiple choice question: Many types of motion occur in our solar system. Which type of motion describes one Earth year?

Only one answer is correct among these 4 choices:
- the revolution of the sun around Earth
- the revolution of Earth around the sun
- the rotation of the sun around Earth
- the rotation of Earth around the sun

Could you tell me which one is correct?

the revolution of Earth around the sun