It has been offered that astrology is bogus because the following "test" can be given:
A group of volunteers, with no knowledge of astrology, are handed lists of sign qualities and asked which ones fit their personality. Then the sign described is revealed to be different from that of the test taker (odds are 11 to 1 that it is). I understand this system is not used in medical examinations though because any group of volunteers with no knowledge of the symptoms they are experiencing may be presumed to be hypochondriacs. Both cases require an etiology of personal assessment.