How to make a schematic 3D model of sun-earth-moon system?

Grasshopper
1

I want to use GH to make a schematic 3D model of sun-earth-moon system.

  1. showing revolution of the earth around the sun and revolution of the moon around the earth
  2. showing self-rotations of the three bodies
  3. show different moon phases due to moon’s location and sun light.
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