If astrology describes a real effect, that effect can be measured. As to you saying that that astrology is description not prediction, I think you and I are using the words and concepts differently. I am well aware that you dont believe that astrology predicts peoples behaviour etc, but that it describes it. But if it can be described, there are inevitably patterns in the data that science could find. When science talks about making a prediction, it doesnt mean it thinks astrology claims to predict the future, but that astrology makes certain claims (and YES it DOES make claims - claims by astrologers supposedly more expert than you). If these claims are true they can be tested and verified. If they cannot be verified, then the claims are not proven and must be taken as the superstitious nonsense they are. If astrology doesn't make any claims at all, then it really has nothing to say.