Although the moon appears much larger on the horizon than when it is directly above, the size of the image it casts on your retina is exactly the same in both locations.

Question

Quizplus · Accepted Answer

The apparent size difference is an optical illusion known as the "moon illusion." The actual size of the image on the retina remains constant because the moon's physical size and distance from Earth do not change significantly.

Although the Moon Appears Much Larger on the Horizon Than