One reason is psychological: being close to the horizon we can compare its size with objects of known dimension and that is why it appears larger . Another cause is physical: refraction . When it is on the horizon, the light rays are noticeably deflected because the air is denser near the surface and because the thickness of the air they have to cross is greater. But the most curious thing is that we continue to see the Moon after setting because the refraction slightly raises its image above its real position.
What leads us to see the largest moon on the horizon?
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New images of Saturn's rings in stunning detail
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