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.. _sample-programs:-solar-system:

Sample Programs: Solar System
=============================

The Solar System Sample Program

To run a sample program, you need to install Panda3D. If you're a Windows
user, you'll find the sample programs in your start menu. If you're a Linux
user, you'll find the sample programs in /usr/share/panda3d.

Screenshots

.. figure:: Screenshot-Sample-Programs-Solar-System.jpg
   :alt: Screenshot-Sample-Programs-Solar-System.jpg

Explanation

This sample program shows planets orbiting around the sun, and a moon orbiting
one of the planets. If you just stare at the moon, you'll realize that its
motion is a spiral:

.. figure:: Spirograph.gif
   :alt: Spirograph.gif

The motion of the moon is only simple if you think about it in relative terms:
the moon is moving in a circle relative to the planet, and the planet is
moving in a circle relative to the sun.

This panda program shows how to implement relative movement and relative
positioning.

Back to the List of Sample Programs:

:ref:`sample-programs-in-the-distribution`