So planetary alignment might be effecting the output of the sun?...
So the astrology stuff* may have some (now defunct) basis in observation, then? That when planets are aligned in a certain way, it affects the amount of output the sun gives off, so winters or summers are harsher which could then have implications on how humans turned out?
*Of which I have almost zero knowledge, so I'm going off of my impressions, which may be wildly off.