Across
- 2. calculated that the shape of the orbits was an ellipse
- 4. theory theory that the earth is at the center of the solar system
- 6. tried to combine the geocentric and heliocentric theories
- 8. theory theory that the sun is at the center of the solar system
- 11. one of the people who developed the Geocentric theory
- 12. small circles that planets move in
Down
- 1. one of the people who developed the Geocentric theory
- 3. a planet's sphere
- 5. invented the telescope
- 7. described the law of gravity
- 9. created the Heliocentric theory
- 10. described epicycles