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.
Dearann an ríomhchlár seo rian de phointe ar chiumhais chiorcail. Rothlaíonn an ciorcal sin timpeall pointe ar chiumhais chiorcail eile, agus mar sin de. Ba iad seo bunús na samhla réamh- héilealárnaí de ghluaiseacht na bpláinéad. Scríofa ag James Youngman.