Question: How do I animate planets on an orbit?

Hi everyone,

I am making a model of the solar system (not to scale) in Maple for a school project. I need to add an animation to make the planets move on the orbits I have for each of them. How do I do this?

I uploaded pictures on a Photobucket account of how I've done it so far to help. This is my first time using Maple so I know that I probably did some things inefficiently. 

Photobucket URL: http://i1070.photobucket.com/albums/u492/nmsnyder007/Capture1_zpsfmitm0ou.jpg

Thanks :)

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