The Moon looks bigger near the horizon because of an illusion, not because it actually changes size. NASA says the Moon is not closer at the horizon, and the atmosphere is not magnifying it. In fact, the Moon can be about 1.5 percent farther away there.
What changes is perception. Your brain compares the Moon with trees, buildings, and the horizon line, then builds a story that makes it seem larger. That is why the effect is strongest when the Moon sits next to familiar objects on the ground.
If you want to test it, take two photos with the same zoom, one near the horizon and one high in the sky. The Moon will come out the same size. The illusion is in your head, not in the sky.
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