I don't really believe in anything--it occurs to be that beliefs are suppositions and confabulations that get in the way of observation--which, faulty though it may be, is the only tool we have to acquire knowledge.

Given that, it has been observed that the shifting of gravitational fields has a major impact on human behavior--and the unpleasant fact (for all you smug skeptics who don't realize you are just as irrational as all the "believers") is that when we observe the movements of astral bodies we indirectly observe gravitational changes--so, based on what we know, planetary movement would be a significant factor in human behavior--