Why does the Moon look bigger near the horizon?
Quick Answer
It is an optical illusion: the Moon’s apparent size stays nearly the same, but our brain compares it with foreground objects and the sky.
The Full Story
The Moon near the horizon is not measurably larger than when it is overhead. The effect is called the Moon illusion, and it is mostly psychological rather than astronomical. Trees, buildings, and the horizon itself give the brain reference points that make the Moon seem bigger. Camera measurements show its angular size remains almost constant at about half a degree. This illusion has been studied for centuries and is still a classic example of how perception can override geometry.
Key Facts
YouTube Angle
Suggested video title for this topic:
"The Moon looks giant at sunset—but is it really bigger?"
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