The journey of a sphere (dark blue) in a system of pure uniform concentric circular motions -moving point of view (dark blue)- [Le voyage d'une sphère (bleue sombre) dans un système de purs mouvements circulaires uniformes -point de vue de la sphère (bleue sombre) en mouvement-]
. 2 3
V R = constant
2
T
---- = constant
3
R
this animation displays a particular trajectory of this sphere
when moved from the farthest sphere to the fixed point.
For each of these intermediate trajectories, the sphere motion is visualized
with the virtual sphere at the origin of coordinates.