With Kepler's 2-d laws of planetary motion
See please
Kepler's laws of planetary motion - Wikipedia, the free encyclopedia
PS One more idea for Mathcad-clock
Old Mathcad-clock - Re: Mathcad-clock for Windows
There is an interesting idea - to create a watch whose face is a kind of satellite orbit with moving sectors, marking the second law of Kepler. See. Drawing and animation!
One video of Kepler clock
It will be good to have this clock here Weil der Stadt – die Keplerstadt im Landkreis Böblingen | Kepler-Museum or here Kepler in Prague
