If this was true wouldn't we expect people born in Northern and Southern regions to exhibit signs consistent with astrological predictions and people born near the equator to be more consistent in their traits?
I would think, that modern astrology is cultural thing, where people self-condition themselves in believing in some of the things, however I can't think of many similarities between me and other people, that would be as the same that I am sharing with my parents(and link to parents is the main in defining my characteristics, even when I do not like that link), so meh.