الفلك

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Across
  1. 2. flattened circle
  2. 5. amount of time a planet takes to circle the sun
  3. 7. famous for the law of gravity
  4. 8. an object that keeps moving at the same pace unless acted upon by a force
  5. 9. transit of mercury across the face of the sun, only happens once per decade
  6. 10. realization that earth is not the center of the universe
  7. 13. Suns inward pull of gravity on a planet that stops it from moving straight
  8. 14. the force that holds us to Earth
  9. 15. A stone site south of England, the sun rose directly over the heel stone on the longest day of the year
Down
  1. 1. provided a more natural explanation of the tangled cosmology
  2. 3. Backwards loops that a planet will take during its orbit
  3. 4. Simplified geometry of the orbits of earth and venus as they move around the sun
  4. 6. slight shift in the observed direction to a star caused by earths motion
  5. 11. A Greek philosopher he taught about the solar system
  6. 12. a push or pull that changes an object direction of motion