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Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown Wikenigma - an Encyclopaedia of Unknowns Wikenigma - an Encyclopaedia of the Unknown

The 'Moon Illusion'

“The Moon illusion is an optical illusion which causes the Moon to appear larger near the horizon than it does higher up in the sky. It has been known since ancient times and recorded by various cultures. The explanation of this illusion is still debated.” source: Wikipedia

What is known is that it's a purely psychological illusion rather than an optical one. The same phenomenon causes distant hills to look far more steeply inclined than they actually are.

Further reading: Helen Ross; Cornelis Plug (2002). he Mystery of The Moon Illusion. USA: Oxford University Press.

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