The funny thing is that there are serious investors out there who base their investment decisions on the phases of the moon. Presumably the fact that there are market movements that coincide with new moons, full moons etc, etc is because sufficient people make decisions based on the fact that it's a new moon or whatever that they actually cause the market change by effectively acting in unison - it becomes a self-fulfilling prophecy. The phases of the moon have no power over the markets, but it seems that they do have a power over the minds of some people who are active in those markets. I'm not sure that self-deception counts as true cause and effect, though.
If you take any set of series of repeating events and simply discard the ones that don't fit the model, then you will end up with a set of "coincidental" alignments that can be used to support any theory that you want to propose - it's an entertaining game (rather like hunting for "ley lines" on a map), but until some causative effect can be demonstrated, it's nothing more than that - a game.