I don't understand the sentence , why "sunlight on the lunar surface"?
The fit of the sun and the moon is so perfect that beads of sunlight can only just penetrate the rugged valleys on the lunar surface, creating the stunning diamond ring effect.

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The sun shines on every surface of every object in the solar system including the surface of the moon.

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IN simple terms, it means the sun is shining on the moon. Beyond that, I am not sure I understand your question.

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I don't really understand your question. If Michael's answer doesn't help,  you may need to elaborate what part you don't understand.

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