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.
Este debuxa o camiño trazado por un punto no extremo dun círculo. Este círculo roda arredor dun punto no extremo de outro círculo, e así sucesivamente, varias veces. Esta era a base para o modelo preheliocéntrico do movemento dos planetas. http: // en. wikipedia. org/ wiki/ Deferent_ and_ epicycle. Escribiuno James Youngman en 1998.