Across
- 3. Measured Earth's circumference using shadows
- 7. Suggested the Earth orbits the Sun
- 8. Developed a geocentric model of the universe
- 9. Revived the heliocentric theory
Down
- 1. Described planetary orbits as elliptical
- 2. Believed the universe followed mathematical harmony
- 4. Created the first star catalog
- 5. Used a telescope to observe Jupiter's moons
- 6. Proposed a model of planets moving in nested spheres