Lighting for orbiting planets Issue

Development Rendering
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1

Hi Guys!

The problem i have is that I was using a directional light for the planets to begin with but now that the planets are orbiting the sun the lighting no longer works and looks terrible, I have also tried to fake the lighting using Dot Product in the materials but I can’t seem to update it on the fly. (I have 5 planets orbiting the sun at different rates and then there are moons orbiting those 5 planets so the dot product might end up quite complicated.)

Just to confirm, the orbits aren’t the problem the lighting is.

Any ideas or possible solutions would be a massive help and are all greatly appreciated.

P.S.
Spotlights or pointlights wouldn’t work due to the scale of the solar system.

Thanks In Advance!

2

Attach a light to the planet using dot. Have the light point to the planet. You can attack the planet and the light to an invisible, noncolliding torus that rotates around the sun.