Taken from Jack White's site...
http://www.aulis.com/jackstudies_index1.html
"An observation on the above study by Peter Wakefield Sault: The angular size of the Moon viewed from the Earth is about half a degree. Since the diameter of the Earth is about four times that of the Moon, the Earth viewed from the Moon should appear to be about four times as wide as the Moon viewed from the Earth, or 2 degrees. As it is, the pasted Earth appears to be about half the diameter of the Moon from Earth."
UPDATE: I found this thread in Yahoo answers. Not included are such inspired answers as 'because its so far away'. For glob's sake! The earth is the same distance from the moon as the moon is from the earth... When you (theoretically) arrive on the moon, it's not like the earth is suddenly four times farther away. But this is a 'counter-theory' to White's above observation:
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