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Unformatted text preview: Kepler's 3 Laws 1. Planets move in elliptical orbits with the Sun at one focus. See Figure 1.27 for an exagerated elliptical orbit. Here is a link to the figure. (Fig. 1.28 in the 2nd ed.) most of the orbits are almost circular Here is a NASA movie clip (Quicktime with sound) that describes the law. This takes a LONG time to load (Over 2 minutes on my fast, University connection). 2. While in an elliptical orbit, a planet moves faster when nearer the Sun than when further away. (radial line from Sun to planet sweeps out equal areas in equal times) Here is a simple animation of Kepler's second law. Here is a link to a Java applet showing Kepler's second law. Click on "red planet" and on "show orbit" if they are not already selected. Then click on the red "start" button in the lower right corner. (You may need to scroll down to see it). Notice how the planet the lower right corner....
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- Spring '10