1. 8.8 Kepler’s Laws
Unit 8: Astronomy
May 16, 2012
Sanders

2. Vocabulary
Ellipse: flattened circle, or oval
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Astronomy

3. Vocabulary Ellipse: flattened circle, or oval
Gravity: force of attraction that exists between all objects in the universe
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Astronomy

4. Vocabulary
Aphelion: point in a planet's orbit at which it is farthest from the sun
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Astronomy

5. Vocabulary
Aphelion: point in a planet's orbit at which it is farthest from the sun
Perihelion: point in a planet's orbit at which it is closest to the sun
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Astronomy

6. Ellipses The earth travels around the sun in an elliptical orbit.
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Astronomy

7. Ellipses The earth travels around the sun in an elliptical orbit.
Orbital velocity is the speed at which a planet travels in its orbit.
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Astronomy

8. Orbital Velocity The earth's orbital velocity is July 10, 2019
Astronomy

9. Orbital Velocity The earth's orbital velocity is
greatest at perihelion
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Astronomy

10. Orbital Velocity The earth's orbital velocity is
greatest at perihelion
least at aphelion
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Astronomy

11. Opposing Forces Inertia keeps the planets in motion. July 10, 2019
Astronomy

12. Opposing Forces Inertia keeps the planets in motion.
The sun's gravitational attraction keeps the planets moving in elliptical orbits and determines their orbital velocities.
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Astronomy

13. July 10, 2019
Astronomy

14. Page 1, ESRT
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Astronomy

15. Ellipses
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Astronomy

16. Kepler’s Laws
In this diagram, the position of Point B has a greater gravitational attraction to the primary focus, F1 than at position A.
Position B also has a greater orbital speed.
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Astronomy

17. July 10, 2019
Astronomy