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# Kepler's laws of motion

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### Kepler's laws of motion

1. 1. Johannas Kepler Planetary Orbital Laws
2. 2. Kepler’s First Law <ul><li>The orbit of the planets are ellipses , with the sun at one focus of the ellipse. </li></ul>
3. 3. Ellipses and Eccentricity <ul><li>The amount of flattening of the ellipse is termed the eccentricity. </li></ul><ul><ul><ul><li>Circle = 0 </li></ul></ul></ul><ul><ul><ul><li>Straight Line = 1 </li></ul></ul></ul>
4. 4. Ellipses <ul><li>The sun is not at the center of the ellipse. </li></ul><ul><li>There is nothing at the other focus. </li></ul>
5. 5. Kepler’s Second Law <ul><li>The line joining the planet to the Sun sweeps out equal areas in equal times as the planet travels around the ellipse. </li></ul><ul><ul><li>Good Example </li></ul></ul><ul><ul><li>Perihelion = Point closest to Sun (fastest) </li></ul></ul><ul><ul><li>Aphelion = Point farthest from Sun (Slowest) </li></ul></ul>
6. 6. Astronomical Distances <ul><li>An Astronomical Unit (AU) is the average distance between Earth and the Sun. </li></ul><ul><ul><ul><li>Used when measuring distances to other solar system objects. </li></ul></ul></ul><ul><li>A Light year is the distance it takes light to travel in 1 year. </li></ul><ul><ul><ul><li>Used to measure distances to other stars and galaxies. </li></ul></ul></ul>
7. 7. Kepler’s Third Law <ul><li>The closer the object is to the Sun the faster its period of revolution. </li></ul><ul><ul><ul><li>Example: </li></ul></ul></ul><ul><ul><ul><li>Earth & Mars Orbit </li></ul></ul></ul>