5.3 Kepler's Laws of Planetary Motion
Instructions:
To start the animation, position the mouse cursor over the image then press the left mouse button. You can stop the movie anytime by pressing the left mouse button a second time.  You may replay the video by clicking on the video with the left mouse button.
Windows: Pressing the right mouse button will invoke a menu that you can use to control the video. You can fast forward, rewind, and move in either direction one frame at a time.  With some browsers, a VCR-type control panel appears below the video. 
Mac: You can control the video by using the VCR-type control panel appearing below the video.

Navigation: You can come back to this window by pressing the "Close Simulation" button on the bottom frame of the utility. 

 start.gif (693 bytes)

Explanation:
The video is an illustration of Kepler's three laws of planetary motion as discussed in section 5.3.
 
Source:
WCB/McGraw-Hill