Sun-Moon-Earth Model

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Across
  1. 3. apparent westward movement of a planet (seen from Earth)
  2. 8. circling of one object around another
  3. 10. a person credited with the Heliocentric Theory
  4. 12. motion of an object relative to the position of its observer
  5. 13. attraction of an object to another, larger object
Down
  1. 1. discovered things did not revolve around the sun
  2. 2. actual movement of an object
  3. 4. means sun (Greek)
  4. 5. one revolution of the Earth around the sun takes a ______
  5. 6. turning motion of an object on its axis
  6. 7. means Earth
  7. 9. the rotation of ________ causes day and night
  8. 11. caused by Earth's revolution around the sun