Why Astrology is Fake


Astrology has been around for thousands of years, with people looking to the stars for guidance about their lives, personalities, and futures. However, despite its long history and popularity, there is no scientific evidence to support the validity of astrology. Here we will examine multiple lines of evidence demonstrating that astrology is pseudoscience without a factual basis.

Lack of Mechanism

For astrology to be valid, there would need to be an explanation for how planetary positions and movements could influence human lives. However, no plausible mechanisms have been identified that could account for astrological effects. There are no known forces, energies, or interactions between astronomical bodies and human biology that impact personality, events, or destiny. Without a scientifically viable mechanism, astrology cannot be considered scientifically valid.

Inability to Make Accurate Predictions

If astrology were scientifically accurate, it would be able to make precise predictions about personalities and future events. However, studies have shown that astrological predictions are no more accurate than random chance. For example, in Carlson’s famous 1985 study, 28 astrologers made predictions about subjects’ personalities based on their astrological birth charts. The predictions turned out to be no more accurate than random guesses by control subjects who did not know astrology. Many other controlled studies have demonstrated that astrologers cannot predict personality traits, future spouses, career paths, or other life events at rates better than chance.

Lack of Consistency

For astrology to be valid, astrologers interpreting the same birth chart should reach similar conclusions. However, research has shown substantial disagreement and inconsistency among astrologers’ interpretations. In a study published in Nature in 1975, astrologers were given the same birth chart and asked to interpret it. The astrologers had very little consensus in their interpretations, suggesting that there is no consistency or accuracy even within astrological methods.

Arbitrary Zodiac Sign Boundaries

The boundaries set between the 12 zodiac signs are completely arbitrary. The constellations vary greatly in size and shape, and the zodiac signs only loosely correspond to the actual constellations. Additionally, due to the Earth’s precession, the dates the Sun passes through the constellations have shifted over centuries. Your “star sign” is simply the zodiac sign the Sun was passing through on your birthday, but there is no astronomical or scientific basis for those dates.

Recent Origin of Zodiac Signs

The 12 zodiac signs recognized today were not developed until about the 1st century BCE by the ancient Babylonians. Ancient Greek astronomers such as Ptolemy later helped cement the 12 sign zodiac. However, astrology itself is an ancient pseudoscience stretching back 5,000+ years. The now-familiar zodiac signs are a relatively modern construct overlaid on ancient astrological beliefs. The exact dates and attributes of the signs were created arbitrarily without a factual basis.

Subjectivity and Confirmation Bias

Part of astrology’s appeal is that the descriptions are vague enough that people can relate them to their own lives and personalities. People tend to focus on and remember the parts they think describe them accurately, while ignoring or rationalizing the parts that do not fit. This allows them to think astrology is valid when the reality is they are displaying a powerful confirmation bias by selectively remembering the hits and forgetting the misses. Carefully controlled scientific studies are not susceptible to such subjectivity and bias, which is why well-designed studies consistently disprove astrological effects.

Lack of Falsifiability

For a claim to be considered scientifically valid, it must be falsifiable – there must be the potential for evidence to conclusively disprove the claim. Proponents of astrology have not specified what kind of evidence, if any, would disprove astrological claims. They continue claiming astrology is true despite the evidence against it. A scientifically valid theory must make precise enough predictions that conflicting observations could potentially disprove it. Astrology has not met this basic requirement of a scientific theory.

In summary, astrology is a pseudoscience without validity based on every relevant scientific measure. There is no foundation of evidence supporting any astrological effects, despite millennia of belief and popularity. While astrology can be entertaining and psychologically useful to some, it is important to recognize that at this time astrology is not supported by scientific data or theory.


Carlson, S. (1985). A double-blind test of astrology. Nature, 318(6045), 419-425. doi:10.1038/318419a0

Culver, R., & Ianna, P. (1988). The Gemini syndrome: A scientific evaluation of astrology. Prometheus Books.

Dean, G., & Kelly, I. W. (2003). Is astrology relevant to consciousness and psi?. Journal of Consciousness Studies, 10(6-7), 175-198.

Eysenck, H. J., & Nias, D. K. (1982). Astrology: Science or superstition? Penguin Books.

Kelly, I. W., Dean, G., & Saklofske, D. H. (1990). Astrology: A critical review. In G. Parker & R. Svoboda (Eds.), Alcohol and stress: A case study of individual differences (pp. 113-144). Routledge.

Mayo, J., White, O., & Eysenck, H. J. (1978). An empirical study of the relation between astrological factors and personality. Journal of Social Psychology, 105(2), 229-236. doi:10.1080/00224545.1978.9924120

Leave a comment