Moon illusion
Perceived variation in the Moon's size
Moon illusion
The Moon illusion is the optical illusion of the Moon appearing 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 illusion is seen also with other celestial objects (such as in a sunset or sunrise, and constellations) and remains inconclusively explained, with the ponzo illusion as a popular explanation.
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