== وصلات خارجية ==* Ptolemaic System - at Rice University's Galileo Project* Java simulation of the Ptolemaic System - at Paul Stoddard's Animated Virtual Planetarium, Northern Illinois University* Epicycle and Deferent Demo - at Rosemary Kennett's website at the University of Syracuse* A flash animation showing epicycles with adjustable parameters and presets for various planets.
[...]==See also==* Epicycloid* Occam's razor* Scientific method==Notes====External links==*Ptolemaic System – at Rice University's Galileo Project*Eccentrics, Deferents, Epicycles, and Equants - at MathPages===Animated illustrations===*Java simulation of the Ptolemaic System – at Paul Stoddard's Animated Virtual Planetarium, Northern Illinois University*Epicycle and Deferent Demo – at Rosemary Kennett's website at the University of Syracuse*A flash animation showing epicycles with adjustable parameters and presets for various planets.