There is an interestingidea -to create a watchwhosefaceis a kind ofsatellite orbitwith movingsectors, marking thesecond law ofKepler.See. Drawingand 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
