Seeing vs. Photographing the Moon: The Moon IllusionOne of the more intriguing visual phenomenon is seeing a giant moon on the horizon. One might think that there is some physical explanation as to why the moon is larger when low on the horizon, but its actually a visual illusion where your brain is playing a trick on you. This illusion is aptly called the “Moon Illusion“.
More on the explanation and examples here:
http://www.jmg-galleries.com/blog/2013/02/19/photographing-moon-moon-illusion/