How exact do you really need to be in your game? Because the movement of planets is actually a surprisingly complex issue. Those numbers you linked are for use with Keplar’s Laws of Planetary Motion. I found This webpage which seems to have a reasonable breakdown of the math involved.
What you will probably need to do is write a script for calculating the position of the planet using those formulas (or a simplified version, like just doing a circular orbit) and update the position of the object each frame.