1. Kepler’s Laws of Planetary Motion
The Law of Ellipses The Law of Equal Area The Law of Harmonies

2. Planets travel in an elliptical orbit with one focus being the sun.
The Law of Ellipses
Planets travel in an elliptical orbit with one focus being the sun.

3. Planets travel the same amount of area in the same amount of time in their orbits.
The Law of Equal Area

5. The rate of revolution depends on distance from the sun.
The Law of Harmonies
The rate of revolution depends on distance from the sun.

6. How do celestial objects stay in orbit?

7. Inertia An object in motion tends to stay in motion An object at rest
tends to stay at rest
*unless acted upon by an outside force*

8. Gravity
The force of gravity decreases with distance from center of gravity.
When a planet is farthest from the sun there is less of a gravitational pull. This causes a planet to move slowest in it’s orbit when farthest from the sun.

10. Use Your ESRT p. 1

11. Eccentricity Eccentricity is measured on a scale of 0-1
The farther apart the foci, the higher the eccentricity

12. Eccentricity- How elongated an ellipse is
Ellipse- A shape drawn using two foci
Focus- A point on the major axis used to draw an ellipse (Plural-Foci)
Major Axis- The longest line that goes through the center of the ellipse

13. Length of Major Axis- 15cm Distance between Foci-5cm
Example Problem
Length of Major Axis- 15cm Distance between Foci-5cm

14. Length of Major Axis- 17cm Distance between Foci- 7cm
Example Problem
Length of Major Axis- 17cm Distance between Foci- 7cm

15. Use Your ESRT p. 15

16. What is a planet’s favorite gum?
Orbit