Elipsis movement in Solar System

Question

I have just a simple problem. How to make my Earth-model spin around the Sun on the ellipsis. I know how to create ellipsis, but I don't get how to force that kind of movement. Thanks for any answers ;)

Answer 1

Set the speed value of the Earth to the tangent at the point on the ellipsis, and add speed to the Earth position.

Answer 2

thanks :)