The planetary orbit simulator linked to below uses JavaScript and HTML to generate a graph of a planetary orbit given its semi-major axis and eccentricity. For more information about how Kepler's Laws describe this orbital shape and motion of planets use the associated exercise and calculator and check out the resources listed below.

Note Before Accessing the Simulation Below

  1. Your browser must be capable of interpreting JavaScript and using cookies.
  2. Depending upon the processor speed of your computer, the orbit may take awhile to be displayed completely. So do not abort the calculation too early.
Interactive Study of Kepler's Laws


Any good college introductory astronomy textbook will be helpful. Below are two such examples. 

Web Sites

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