Terrence, the problem is that "twin studies" are designed to determine the relative influence on character and behavior of heredity (genetic endowment) and environment. If you find (as the Minnesota Study did -- not that it does not have its critics) that twins are more alike than they are different, this only proves that heredity is more important; if you find the reverse, then environment is more important. Such studies can prove nothing about astrology.
If you really seriously wanted to do a study of "astrological influence," you would use individuals who were born at exactly the same time, same place, etc., but who are unrelated to one another. Otherwise, any similarities you would find would be attributed to their sharing similar genes, not a similar astrological chart.
Furthermore, astrology is just not taken seriously in the scientific community. And I find it difficult to imagine that any university, research institute, or foundation would pour money into a long-term research project that would examine the possible influence of "the stars" on character & behavior. |