Undoubtedly true? Well i doubt it (and so are many MANY people) if it was true it would give correct results (for everyone not just somebody) like 90% of the time (at least) and that is not the case right? Right case closed.
P.S. quotes from Wikipedia
At the end of the 17th century, new scientific concepts in astronomy and physics called astrology into question. Astrology thus lost its academic and theoretical standing, and common belief in astrology has largely declined. Astrology has been rejected by the scientific community as a pseudoscience, having no validity or explanatory power for describing the universe. Among other issues, there is no proposed mechanism of action by which the positions and motions of stars and planets could affect people and events on Earth that does not contradict well understood basic aspects of biology and physics. Scientific testing of astrology has found no evidence to support any of the premises or purported effects outlined in astrological traditions. In one study, participating astrologers attempting to match natal charts with profiles generated by a psychological inventory produced results not significantly at variance with random chance. Those who continue to have faith in astrology have been characterized as doing so "in spite of the fact that there is no verified scientific basis for their beliefs, and indeed that there is strong evidence to the contrary". According to available literature Astrology believers tend to selectively remember those predictions which have turned out to be true, and do not remember those predictions which happen to be false. There is no consensus amongst astrologers as to what astrology is or what it can predict. Most professional astrologers are paid to predict the future or describe a person's personality and life, but most horoscopes only make vague untestable statements that can apply to almost anyone.