Well, I'm an identical twin, and we both just got into the same college (Harvard). Could that be evidence of astrology's power?
Well, the trouble is that you can't run an experiment using this because of all the other factors that are similar between twins. For example, my brother and I are very similar students and some pairs of twins might both use the same lottery numbers.
In general, running this sort of thought experiment is a silly idea. To be honest, I'm not sure what your point is, woodwater... If you're saying that you want to test whether astrology works by seeing if two twins have similar things happen to each other, then I'd be happy to test that. I could type up a few questions about the differences between us, or whatever your suggested protocol is. Or, we could flip coins and see if the flips come up the same way more than would be predicted by chance.
There is one issue that might complicate things, however- our birthday is February 19th, which is often stated as the cutoff point between Aquarius and Pisces. Although our birth certificates suggest that our times of birth are only one minute apart, astrologers could offer the post hoc hypothesis that one of us is Aquarius and one Pisces, or our segmented-house trigonometry is double bisected at the point where Saturn's orbit intersects the elliptic plane or whatever.