1. Geocentric Model

2. Epicycles & Deferents

3. Galileo’s discoveries Moon has mountains

4. Galileo’s discoveries Sun has spots

5. Galileo’s discoveries Saturn has rings

6. Galileo’s discoveries Milky Way is a collection of stars

7. Galileo’s discoveries Jupiter has 4 large moons

8. Galileo’s discoveries Venus experiences phases like Moon

9. Phases of Venus Geocentric Model –Venus is always found close to the Sun in the sky –Sun & Venus must move along deferents at the same rate –Can never observe “full” Venus

10. Phases of Venus Heliocentric Model –Venus is always found close to the Sun in the sky –Venus must be an inferior planet