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This is a purely psychological phenomenon based on the mechanisms of human perception. When the sun is low, we compare it to ther objects on the earth, such as houses. And since the sun is much farther away ('on the horizon') than these houses, we intuitively scale it to be much larger. While the sun is high up in the sky, we do not see anything hear it to compare with, so it seems 'unenlarged' to the human perception. This 'enlargement' effect is not detected when measured with apparatus such as using photographs. --------------------------------------- remark: The earth's atmosphere does not cause this effect. In fact, shortly after sunrise and shortly before sunset, the refraction of the sun's light in the atmosphere reduces the vertical diameter of the sun, making it egg-shaped (elliptical) like an egg lying on its side. This effect makes the sun seem *smaller* in the vertical direction than usual (for some minutes after sunrise and before sunset), and therefore it does not explain the enlarged perception of the sun by humans.

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Q: Why sun seems big in morning and evening?
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