The modern astronomy

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