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Originally Posted by OneOfOne
Of course this raises the question, if you were on the Moon, would the Earth appear "bigger"? Possibly not, as the clues we use on earth don't exist on the Moon
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The simplest explanation I have heard for the moon illusion is tied to how we perceive the shape of the sky in spacial terms. Instead of perceiving it as a hemisphere, we see it more as a shallow upside down dish.
This gives the perception that objects overhead are closer than those toward the horizon and accounts for the apparent size differences that we perceive.
The same should apply I would think viewing Earth standing on the moon.