Hate to be captain bringdown here but astrology doesn't work man, just like palmistry or tea-leaf reading it works on the principles of cold reading. Google "forer and barnum statements" or "the forer and barnum effect" and you'll see it explained. Alternatively, watch this:
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It'd be great to think it actually worked but there's no reason to believe that there could be a correlation between someone's personality or even their future based on the positions of stars.
That said, if you do have an understanding of astrology it's great as "chick crack". You can use it to read a girl in-field as a fantastic way of building comfort.