Across
- 2. The first astronomer to use a telescope to make observations of the universe
- 3. When planets seem to move in the opposite direction to their main movement
- 4. The model of the universe that places the Earth at the centre
- 5. The shape of the orbits of planets suggested by Copernicus
- 8. The astronomer who proposed the heliocentric model
Down
- 1. The model of the universe that places the Sun at the centre
- 4. The language where the prefixes 'geo' and 'helio' are derived from
- 6. The philosopher who added 'epicycles' to the geocentric model
- 7. The philosopher who proposed the geocentric model