Across
- 2. last name of scientist who described laws of planetary motion
- 3. slow wobble in Earth’s rotational axis
- 7. ocean level changes caused mainly by Moon’s gravity
- 8. time for one full rotation of Earth
- 11. measure of how stretched Earth’s orbit is
- 14. one complete orbit of Earth around the Sun
- 15. point when Earth is farthest from the Sun
- 18. spinning of Earth on its axis
- 19. longest or shortest day of the year
- 20. imaginary line Earth spins around
Down
- 1. speed and direction of Earth’s motion
- 4. plane of Earth’s orbit around the Sun
- 5. point when Earth is closest to the Sun
- 6. force that keeps Earth in orbit
- 9. time for one full revolution of Earth
- 10. tendency of an object to resist a change in motion
- 12. path Earth follows around the Sun
- 13. shape of Earth’s orbit
- 16. day and night are equal length
- 17. yearly weather patterns caused by tilt and revolution