Pixel42
Schrödinger's cat
I have to say I agree with Garrette. You seem to be saying that all the dozens of studies that have been done so far were a waste of time because they didn't test what astrology really is, despite the fact that they all tested claims made by real astrologers. In that case you need to tell us what you think astrology really is, and point to the studies that show those claims really do stand up.Why don't you tell me what you think it claims to be and what you think it's practitioners think it is, so we can figure out whether you are objecting to it based on some understanding of it or simply because it does not fit your world view.
"Observational evidence" is what convinced astrologers and their clients that the claims already tested were true; they weren't. The perception that they were was erroneous, an artifact of our cognitive biases. What leads you to think that claims which have not yet been tested will be different?By evidence, I assume you mean a formal objective study and the answer is that to the best of my knowledge there is no objective evidence for or against it. I think it should be studied, best place to start would be India. You could identify a dozen experts in the US, but that would take some work.
There is (apparently) a lot of evidence that newspaper astrology ("you are a kind person who likes people") is useless, and I think it would not be too hard to conclude that the majority of astrologers working in new age havens like Sedona, AZ are useless. Studies based on such people are also useless.
There is observational evidence that astrology works, though perhaps not for what is often referred to as western astrology. There are different kinds of astrology. I'm not very familiar with western astrology.
ETA: Indian scientists on Vedic astrology
2009, Vol 96(5), 641-643
A statistical test of astrology
The first statistical test of astrology made in India. Indian astrologers claim they can tell your intelligence from your horoscope. But 27 astrologers failed to perform better than chance when given 40 horoscopes of bright children and retarded children. J.V.NARLIKAR et al, Inter-University Centre for Astronomy and Astrophysics, Pune. Further details, other failures by Indian strologers, and more on the UGC (by 2001 grants to establish university departments of astrology had been approved for 20 out of 45 applicants) are in Narlikar's An Indian Test of Indian Astrology, Skeptical Inquirer 37(2), 45-49, March/April 2013.
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