[JAVA3D] Positioning object

[Sackmunky]

I know that this forum is on the "proggramming aspect of java3d" but can anyone help on this. I have a Sphere at(0.0.0) and an object that I want to place on the Sphere. Whereever I place it, I want it to always rotate the center point of that object to (0,0,0). Can anyone help?   Zak   PS. They were saying something about the tangent lines.....etc. I am very weak in geometry. :(