Context. If you actually measure it when it looks different sizes, you’ll see that it is the exact same size. The difference is that when it looks big, it is close to the horizon, where we can see it compared to things on the ground. We see the Moon behind everything, but still a significant size, this lets us know that it is big, so our mind adjusts how big we think it is. When it’s in the middle of the sky though, there’s nothing to compare it to, so you just see it for the size it is.
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