Hello, I would show a mooving point alone (successive positions) and then show the evolving trajectory of this point. All this I could do many years ago with version 5.2 ( !!) ; I am used to Manipulate and never faced problems when animating objects (even heavy ones). But my code produces no animation. Could someone help me to find what is lacking. Please see the attached nb.

Thank you very much.

R.K.