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The moon illusion , again.

 
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http://www.technologyreview.com/view/509966/moon-illusion-new-theory-reignites-debate-over-why-moon-appears-larger-near-the-horizon/
 
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The article talks about a new theory to explain why the moon appears larger at the horizon.

The traditional explanation is the Ebbinghaus illusion (see image below)

Note: I had to convert the image to a png. The original is from Wikipedia
Mond-vergleich.png
[Thumbnail for Mond-vergleich.png]
Ebbinghaus illusion (Source Wikipedia)
 
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