The Moon appears larger in the sky during moonrise and moonset. This is an optical illusion called the moon illusion.

Here's why it happens:

* Perspective: When the Moon is near the horizon, it appears closer to objects like trees and buildings, which act as a reference point. This makes the Moon seem larger in comparison.

* Atmospheric Distortion: The atmosphere bends light, making objects appear larger and closer when they are near the horizon. This effect is more pronounced at sunset and sunrise.

* Cognitive Bias: Our brains tend to perceive things as bigger when they are surrounded by other objects, further amplifying the illusion.

It's important to note that the Moon's actual size doesn't change during moonrise or moonset. The illusion is simply a trick of our perception.