History of Astronomy

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Across
  1. 3. US vs USSR name
  2. 5. where a star is positioned
  3. 8. a calendar based on the sun
  4. 10. Earth-centered Universe
  5. 13. discovered that orbits are ellipses
  6. 14. heliocentric dude who thought orbits were circles
  7. 15. figured out positions of 777 stars
  8. 16. two of these are in an ellipse
  9. 17. its launch started Space Race
  10. 18. P^2 = a^3
  11. 20. dude who figured out the size of Earth
  12. 22. gravity dude
Down
  1. 1. telescope dude who found the moons of Jupiter and phases of Venus
  2. 2. measured by Newton's version of Kepler's 3rd law
  3. 4. Ancient Greek dude who thought Sun was center of Universe
  4. 6. the flatness of an ellipse
  5. 7. sun-centered universe
  6. 9. a calendar based on the moon
  7. 11. the shape of orbits
  8. 12. galaxy and redshift dude
  9. 19. Ancient Greek dude who thought the Earth was the center of Universe
  10. 21. geocentric dude from long ago