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I'm not really sure what the question is asking.
Are you asking what is the physical scale of the "pixelation" you would get pointing an earth-based telescope at the moon?
If so - the moon has an angular diameter of ~0.5 degrees
So 1 arcsecond is 1/1800 of this.
The radius of the moon is 1737.4 km
The actual diameter of the moon is 3474.8 km
So the size of the pixel (smallest spot you could see) is 3474.8/1800 km or ~2km.
Your answer seems to be confusing units a lot.
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