When it's way overhead - it's the moon. You've seen it all your life. It's just there.
When it's on the horizon - your automatic distance-judging machinery (we're talking more than just parallax and depth perception here - I mean the whole process) says "hey that thing is really far away, and way, way past the horizon, way further away than those mountains, so it's obviously really, really big by comparison (which is completely true).
Humans perceive the world more or less on a horizontal plane - so we interpret things in that plane differently than we do things above/below us.
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It's a purely psychological effect.
When it's way overhead - it's the moon. You've seen it all your life. It's just there.
When it's on the horizon - your automatic distance-judging machinery (we're talking more than just parallax and depth perception here - I mean the whole process) says "hey that thing is really far away, and way, way past the horizon, way further away than those mountains, so it's obviously really, really big by comparison (which is completely true).
Humans perceive the world more or less on a horizontal plane - so we interpret things in that plane differently than we do things above/below us.
You're supposed to try putting your head between your legs to look at the regular moon upside down to get the same effect (I'm not kidding).
A camera is not susceptible to psychological effects i believe. Will it be bigger on a picture?
The camera isn't, but our brain still is when we process the picture taken by the camera.
But the key point is having some other objects in the picture that will give you the perspective change.