This draws the path traced out by a point on the edge of a circle. That circle rotates around a point on the rim of another circle, and so on, several times. These were the basis for the pre-heliocentric model of planetary motion. http: / /en. wikipedia. org/ wiki/ Deferent_and_epicycle Written by James Youngman; 1998.
Dit programma tekent in paad dat útstippele wurdt troch in punt op de râne fan in sirkel. Dizze sirkel rotearret dêrnei om in punt op de râne fan in oare sirkel. Dizze sirkel rotearret op de râne fan in oare sirkel ensfh. Dit wie de basis foar de pre- helosintrysk model fan planetêre bewegingen. Skreaun troch James Youngman.