Visually it appears that the lighting in the solar demo is off because for example the blue planet (Earth?) is always lit on the face closest to the viewer, not the face lit by the sun. Am I correct and how can the simulation be corrected for this? (Btw, I was able to slow down the simulation enough to make this observation by changing RUNDELAY to 10.) I assume that the sun must be a light source, but I cannot find an example which makes one object a light source, and not another.
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