4. Geocentric Model

5. Heliocentric Model

6. Did you know???? (do not write)  It wasn’t until 1851 that experimental proof of the motion of Earth was found

7. Proof for the Heliocentric Model  Proofs: Coriolis effect, Foucault pendulum, seasons, parallax (apparent shifting of stars)- EARTH IS NOT STATIONARY

8. New Definitions:  Year: Time required for a planet (Earth) to complete one orbit around its primary (the sun); 365.25 days on Earth  Primary: Object around which a satellite moves

9. Review of Definitions  Revolution: Orbital motion of a satellite around its primary  Foucault pendulum: Weight that is free to rotate as it swings back and forth; its slow change in direction of a swing is proof of Earth’s rotation  Axis: Imaginary line around which an object rotates

10. Review of Definitions  Rotation: Spinning of a body around an internal axis (The Earth’s rotation causes day and night)  Orbit: Path (usually an ellipse) of any satellite around its primary  Coriolis Effect: Bending of the winds due to Earth’s rotation