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Answered 2009-08-09 03:56:13

When the moon is nearer the horizon it is being observed through more atmosphere. The air acts as a magnifying glass and makes the moon appear much larger. As it rises higher in the sky, there is less air distortion and it appears a normal size. See the related question linked below. The atmosphere explanation is not generally held to play a major role in this illusion. Here's a link that explains it:

http://apod.NASA.gov/apod/ap031011.html

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