When the moon is near the horizon it appears larger than when it is high in the sky. This effect is primarily a result of?

The phenomenon where the moon appears larger near the horizon than when it is high in the sky is primarily due to the Ponzo illusion, a psychological effect. When the moon is close to the horizon, our brains compare it to objects on the ground, like trees and buildings, creating a perception of increased size. In contrast, when the moon is overhead, there are fewer reference points, making it appear smaller. This is an optical illusion rather than an actual change in the moon's size.