Kepler System Model written by Dr. Todd Timberlake
Access Rights: Free access
License: This material is released under the Creative Commons Attribution 3.0.
Rights Holder: Todd Timberlake
Keywords: EJS, Earth, Easy Java Simulations, Kepler, OSP, Open Source Physics, Sun, celestial globe, celestial sphere, elliptical, orbit, orbit
reference:
http://www.compadre.org/osp/items/detail.cfm?ID=9757
The Kepler System model simulates Kepler's final theory of planetary motion. In this theory the planets orbit in ellipses with Sun at one focus (Kepler's First law). These elliptical orbits are not necessarily all in the same plane. A line from Sun to the planet sweeps out equal areas in equal times (Kepler's Second law). The square a planet's period is directly proportional to the cube of the semimajor axis of its elliptical orbit (Kepler's Third law).  The simulation shows Earth's orbit around Sun, as well as the orbit of one other planet. The user can choose to show one of the five visible planets (Mercury, Venus, Mars, Jupiter, or Saturn), or a fictitious planet. The top window shows the orbits of the planets around Sun. The view can be changed by clicking and dragging in the window and a zoom slider is provided to zoom in or out. The bottom window shows the view of Sun and planet against the background stars as seen from Earth.

i will be remix this into applet for the inquiry based learning of  F=GMm/r^2 and T^2 proportional to r^3 based on data.

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