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If i remember correctly. Standard exposure of the moon is 1/ISO shutter @ f/11
So the shutter is 3 1/3 stops faster than needed and the aperture is 2 stops larger than f/11. So the moon ends up being slightly underexposed. Which is ok, as it gives more detail, to save blowing out the highlights.
The reason to go for such a high shutter is to minimise camera shake, seeing as it was being handheld. and at 600mm + 1.6 focal length crop due to the smaller sensor on the 20D, ends up being 960mm focal length. And the rule goes for that.. 1/focal length for shutter speed to eliminate shake.
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