I don't buy it.* Quoting the father of Behavioral Finance:
...The Rock Man said, "Say, babe, there ain't nothing pointless about this gig. The thing is you see what you want to see and you hear what you want to hear. You dig? Did you ever see Paris?"
"Did you ever see New Delhi?"
"Well, that's it. You see what you want to see and you hear what you want to hear." And with that the Rock Man fell soundly asleep...
-from Harry Nilsson's The Point!
From Slope of Hope:
"Moonstruck: Lunar Cycle Says Expect Market Rally"
*On the other hand All About Alpha has a learned and erudite post (HT: Alphaville):
A Hedge Fund Risk Profile Changes As the Moon Waxes and Wanes