TLDR
Astrologers could not match people's birth charts to their real personalities better than random guessing, so astrology did not work in this scientific test.
Summary
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1 Study Aim
The paper set out to test whether astrologers could accurately match a person's natal chart (a map of the positions of planets at birth, used in astrology) to that person's actual personality profile. The main goal was to see if astrology could reliably describe personality traits in a way that is better than chance. Astrology was tested to see if it could really tell what someone is like as a person.
2 Study Design
The research used a double-blind experimental design, meaning neither the astrologers nor the participants knew which charts or profiles belonged to whom during the test. Astrologers were given natal charts and three personality profiles for each person, only one of which was correct. The personality profiles were based on the California Psychological Inventory (CPI), a standard psychological test. The astrologers' task was to match each natal chart to the correct CPI profile. The study included reputable astrologers who had some background in psychology and were familiar with the CPI. Astrologers tried to match birth charts to real personality descriptions without knowing who was who, using a fair and careful test.
3 Findings
The study reveals that astrologers were unable to match natal charts to the correct personality profiles at a rate better than chance. Their success rate was about the same as random guessing, which means astrology did not show any special ability to describe personality in this controlled setting. The results suggest that astrology, as practiced by professional astrologers, does not provide accurate information about personality traits. The paper recommends skepticism toward claims that astrology can reliably describe or predict personality. Astrologers could not pick the right personality for each birth chart any better than if they just guessed, so astrology did not work in this test.