Earth, the Moon, and the Sun

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Across
  1. 2. Earth's motion on its axis
  2. 5. Another word for orbit
  3. 7. The imaginary line that goes through the center of Earth
  4. 8. The four periods into which a year can be divided
  5. 9. Another word for rotation
Down
  1. 1. Earth's trip around the sun
  2. 3. The curved path that Earth follows to travel around the sun
  3. 4. The changes in the way the moon appears
  4. 6. The object that orbits Earth
  5. 8. The largest object in the solar system