Any stock traders out there heard of the lunar cycle effect on stocks?

That is that the change in the cycle of the moon affects people's stock trading decisions. You could throw in gravitational pressure differences between the moon's closest approach and farthest out it is while in orbit. I've seen charts online indicating the moon cycle and gravitational differences affect people's decisions to buy and sell stocks. I was wondering if anyone here had researched it or confirmed it via backtesting. Here are a couple of links. lunatictrader.com

images.search.yahoo.com