Orbit animation

I'm running a D&D game in a world I've created and I have a sun and two moons that orbit around the world itself. I have orbit paths that I have created in Sketchup, but I would like an animation of the orbits so that I could calculate when eclipses will happen. I have a blender file as well with a simple model of the world, the light source, and the two moons at approximate sizes and elevations. My blender skills are terrible, but I imagine it wouldn't take an experienced person too long to run an animation loop?