This applet shows the position of the planets in their orbit around the sun.

The period of rotation T of a planet is given by:

T

where G = universal gravitational constant = 6.6743 x 10

M = mass of the Sun = 1.9889 x 10

r = radius of the orbit of the planet

This is Kepler's 3rd Law of Planetary Motion: T

Planet | Distance from Sun r (km) | Period of Revolution T (years) |

Mercury | 57 900 000 | 86 days |

Venus | 108 200 000 | 225 days |

Earth | 149 600 000 | 1 |

Mars | 227 392 000 | 1.88 |

Jupiter | 778 300 000 | 11.9 |

Saturn | 1 427 000 000 | 29.5 |

Uranus | 2 870 000 000 | 84.0 |

Neptune | 4 497 000 000 | 164 |

Right-click here to download this page and the Java Class File.