What Controlled Tests of Astrology Have Found
There is a published empirical record. Reading it well means reporting what it found, what it could not settle, and where it is contested, without reaching for a single decisive verdict in either direction.
Modern WesternCross-traditionScientific studyScientific criticismEditorial synthesis
In this lesson
- Describe the design of the most widely discussed controlled test
- State what the published record has and has not established
- Explain the testability objection raised in critical reviews
- Report a contested literature without cherry-picking either way
Astrology is not an established science, and this platform does not imply otherwise. That statement is worth more when you know what it actually rests on.
The most discussed experiment
A double-blind experiment published in Nature in 1985 asked astrologers to match natal charts to personality profiles. Their matching did not perform better than chance.[1]
A later independent double-blind test, pairing a standard personality inventory with computer-generated natal interpretations, reached a comparable conclusion.[2]
The deeper objection is about testability
Critical reviews of the wider literature argue something more awkward than 'the tests failed': that astrological interpretation is too loosely constrained to be decisively tested at all, because a sufficiently flexible reading can accommodate almost any outcome.[3]
If that is right, then a study finding no effect and a practitioner reporting success are not straightforwardly in contradiction; they are measuring different things. That is an uncomfortable conclusion for both sides of the argument, which is a reason to take it seriously rather than a reason to skip it.
How to hold this honestly
Individual studies in this literature differ in design and scope and some have been contested, including by reanalysis. This platform reports the body of published work and the argument around it rather than a single decisive verdict.
The practical consequence runs through the whole product: an interpretive claim is presented as what a tradition holds, never as a finding, because the second would require evidence that the published record does not provide.
In brief
A 1985 double-blind experiment in Nature found astrologers' chart-to-profile matching no better than chance, and a later independent double-blind test reached a comparable conclusion. Critical reviews raise a deeper objection: that astrological interpretation may be too loosely constrained to be decisively tested. The literature is contested in places, so it is reported as a body of work and an argument, not as a single verdict.
Check your understanding
Check your understanding:
- What did the 1985 experiment ask astrologers to do, and what was the result?
- State the testability objection in one sentence.
- Why does this platform avoid presenting a single decisive verdict?
References
Numbered citations in the text link to the records below; each record links to the full source registry.
- Shawn Carlson. A double-blind test of astrology. Nature 318 (6045), pp. 419-425. 1985. Scientific study View source record
- Alyssa Jayne Wyman; Stuart Vyse. Science Versus the Stars: A Double-Blind Test of the Validity of the NEO Five-Factor Inventory and Computer-Generated Astrological Natal Charts. The Journal of General Psychology 135 (3), pp. 287-300. 2008. Scientific study View source record
- I. W. Kelly. Why Astrology Doesn't Work. Psychological Reports 82 (2), pp. 527-546. 1998. Scientific criticism View source record