The modern astronomy

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Across
  1. 1. The point at which the moon is closest to earth
  2. 4. eclipse An eclipse of the moon,moon passes through earth's shadow
  3. 6. eclipse An eclipse of the sun,the sun passes through earths shadow
  4. 8. motion The apparent westward motion of the planets with respect to the stars
  5. 10. Earth centered universe
  6. 11. The point in the orbit of a planet where it is closest to the sun
  7. 12. Sun centered universe
  8. 14. A slow motion of earths axis that traces out a cone over a period of 26000 years
  9. 16. The depression at the summit of a volcano caused by a meteorite impact
  10. 17. The study of the universe
Down
  1. 2. The motion of one body about another
  2. 3. An oval path
  3. 5. The place in the orbit of a planet where it is furthest away from the sun
  4. 7. The point where the moon is furthest from the earth
  5. 9. unit Average distance from the earth to the sun
  6. 13. Any of a system of bright elongated streaks,sometimes associated with a crater on the moon
  7. 15. The spinning of a body about its axis
  8. 18. The path an object makes as it goes around another object in space
  9. 19. Smooth areas on the moon