Although it appears that the moon doesn't move very quickly, you don't need a very long exposure before it goes out of shape. Knowing this, I experimented with different shutter speeds and found that at 2sec the moon is slightly oblong and by 4sec the distortion is very noticeable.
Here's another shot, taken at 0.5sec; zoomed closer and sitting in a soft bed of clouds.
And below is a shot taken about 10 minutes later, with a 15sec exposure. The sky is a lot lighter but the moon is completely blown out and so has lost all definition in the craters. In addition, it's creating a definite smudge across the image as it moves.
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