Lucky you. We haven't seen the moon (or anything else) for over a month.
This is one one of the oddest illusions around. There is no, one, accepted explanation. I believe the current leader is how we perceive the 'shape' of the sky: like the flattened dome of a stadium as opposed to its 'real' shape of a half-sphere.
Apparently the effect disappears if you look at the moon upside-down.
For those of you without a "prosperous" waistline, bend over with your head between your legs and look at the rising moon. It (is supposed to) appear much smaller.
But as Trevor notes - not something you want to do with a lot of people around!
Addendum:19:04 EST. Miraculously, the month-long cloud has disappeared and I just tried the experiment. For a second it looked smaller, but then I got dizzy, fell over and had to sit down!!
