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