^^^ There was a study of time twins, here's the link: http://theskepticnextdoor.com/2008/12/10/time-twins-the-definitive-test-of-astrology/
Results:
* Was there a correlation between the time twins as predicted by astrology? No, the correlation was -0.003 with a standard deviation of 0.028 (N=1393 due to missing data).
* Was there a correlation between the control data from the mothers? No, the correlation was 0.001 with a standard deviation of 0.029 (N=2066).
* If the 110 variables were analyzed separately, was there any correlation? No more than expect by chance. There were 5 out of 110 at a confidence level of 95%. 5.5 would be expected by random chance.
* If the subjects were ordered randomly what was the correlation? -0.001, sd 0.0028 for both the subjects and mothers.
Summary
Astrology predicts that the date and time of birth determine personality characteristics that can be read from a birth chart. In this experiment there was no correlation between individuals born closely together (in approximately the same location). Any similarities of traits between the time twins was due to random chance.
Results:
* Was there a correlation between the time twins as predicted by astrology? No, the correlation was -0.003 with a standard deviation of 0.028 (N=1393 due to missing data).
* Was there a correlation between the control data from the mothers? No, the correlation was 0.001 with a standard deviation of 0.029 (N=2066).
* If the 110 variables were analyzed separately, was there any correlation? No more than expect by chance. There were 5 out of 110 at a confidence level of 95%. 5.5 would be expected by random chance.
* If the subjects were ordered randomly what was the correlation? -0.001, sd 0.0028 for both the subjects and mothers.
Summary
Astrology predicts that the date and time of birth determine personality characteristics that can be read from a birth chart. In this experiment there was no correlation between individuals born closely together (in approximately the same location). Any similarities of traits between the time twins was due to random chance.