Hi nimos100, thanks for your reply.
I don't understand why you write that my player turns 60 times a second. It's rotating clockwise, from left to right, like a clock... Did I miss something?
When I check the parameters changes with the debugger, I see that my variable "gravity_angle" is only changing when touching the other gravity zone, not before (my "Passerelle" event is useless).
If I disable my last toggle, my player falls (because it is not attracted by my planet).
I made no success on this direction.
Finally, I make my player jumps just enough to touch softly the other gravity zone, making the rebound not visible. And I don't need any "passerelle" anymore...
But still, I don't understand why my event is ineffective.