Perhaps the most widely accepted explanation of the moon illusion is that, like most other size illusions, it results from a misperception of distance. The actual distance from an observer on the earth's surface to the moon is virtually:
A) greater when the moon is at the horizon,
B) the same when the moon is at the horizon and when it is directly overhead.
C) closer when the moon is at the horizon and when it is directly overhead.
D) the same when the moon is at the zenith position.

Question

Quizplus · Accepted Answer

The actual distance from an observer on Earth to the moon remains virtually the same whether the moon is at the horizon or directly overhead. The perceived size difference is due to a misperception of distance, not an actual change in distance.

Perhaps the Most Widely Accepted Explanation of the Moon Illusion