The horoscopes don't contain specific data on everybod, it's just an overlay what should happen to you that day. For example, todays horoscope for aquarius(for me):
Daily work (by Astrology.com)
Be bold at work right now and make things happen. An unusual array of challenges require a quick and creative solution -- and you're just the person to dream up that ingenious plan
See? It IS true in a meaining. My freakin system crached and I was working on it all day today, solving problems as they came. So it is true for me, and probably true for another thousand aquarius worldwide...
It doesnt contain specific data, but it mentions kinds of actions and feelings that might happen to you on that day...
It is quite amazing how accurate this Yahoo! Horoscope can be