History of the Solar System Model

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Across
  1. 3. Prefix used for "sun"
  2. 4. This group created many calendars using astronomy
  3. 5. Westward drift of the planets
  4. 7. Created the first telescope
  5. 10. How many planets did we originally believe existed?
  6. 11. Name of the star the Egyptians used to predict the flooding of the Nile
  7. 15. Shape of the planets
  8. 16. The amount time it takes to make one complete rotation
  9. 17. The ____ a planet is to the Sun, shorter the orbital period
  10. 18. First person to believe Earth was a sphere
  11. 19. Smaller circular patterns
  12. 20. Structure with unknown builders that people visit during summer/winter solstices
  13. 23. The study of the universe
Down
  1. 1. Copernicus said "Earth is a _______"
  2. 2. The amount of time for Earth to orbit around the sun
  3. 6. Actually the first Greek to propose Heliocentric model
  4. 8. Shape of the path around the Sun
  5. 9. Ancient Greeks believed in this early model
  6. 12. Kepler's _______ law said planets move faster at perihelion
  7. 13. This Greek published the first idea of geocentric
  8. 14. Came up with 3 Laws of Planetary Motion
  9. 21. Prefix meaning "Earth"
  10. 22. Aristotle believed the Earth was a sphere because of the curved shadow on the moon