Hippopede of Eudoxos
This is the final part of the solarsystem book.
It shows a model for the solar system from the ancient greeks, published by the not so famous Eudoxos of Knidos.
He tried to simulate the opposition loops by constructing 3 rotating spheres with different orientation and spin direction.
The stationary loop is a so called hippopede and can also be constructed by the intersection of a sphere and a cylinder, as illustrated in this applet.
Thank you for going through the whole series!