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aquest dibuixa la ruta traçada per un punt en la vora d' un cercle. aquest cercle gira al voltant de la vora d' un altre cercle i així vàries vegades. aquestes eren les bases del model de moviment planetari pre- heliocèntric. http: // en. wikipedia. org/ wiki/ deferent_ and_ epicycle escrit per james youngman; 1998.
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.