Across
- 3. used a telescope to observe other planets
- 6. states the paths of planets are ellipses with the sun at one focus
- 7. model made by Copernicus showing the sun as the center
Down
- 1. realized the charts of time didn't predict astronomical events
- 2. states an imaginary line from the sun to a planet sweeps out equal areas in equal time
- 4. states (Ta/Tb)squared = (Ra/Rb)cubed
- 5. model made by Ptolemy using earth as the center of the center