Something interesting happens when you tell people you believe in both astrology and psychology. The psychologists think you have left the building. The astrology people think you are hedging. And yet here most of us are, knowing our sun, moon, and rising signs while also being able to explain what the Big Five model of personality actually measures. We are not confused. We are just using two different tools for the same job.
This piece is not going to tell you that one of them is right and one is wrong. That debate has been settled, repeatedly, in peer-reviewed journals, and it has not stopped anyone from reading their Co-Star notification at 7am. What this piece is going to do is explain exactly what each system is doing, why both of them feel useful, and what that tells us about human beings and our perpetual, slightly desperate need to understand ourselves.
Astrology, in its traditional form, proposes that the position of celestial bodies at the moment of your birth shapes your personality, tendencies, and life trajectory. The Western system most people use in English-speaking countries is primarily sun-sign astrology, which is the newspaper horoscope version: one of twelve signs based on your birth month, each with associated traits.
Serious practitioners of astrology, though, find this reductive. A full birth chart includes the rising sign (which governs how you appear to others), the moon sign (which governs emotional responses), and the placement of each planet in a specific house (which governs different domains of life). A proper chart reading is not "you are a Scorpio, you are intense." It is a complex, interlocking system of dozens of variables that would take an experienced practitioner hours to fully interpret.
The scientific evidence for astrology's predictive validity is, to put it politely, not there. The most comprehensive study, the Shawn Carlson double-blind experiment published in Nature in 1985, found that professional astrologers could not match birth charts to personality profiles at a rate better than chance. Multiple replications have reached similar conclusions.
And yet. The people who use astrology are not, in the main, scientifically illiterate. Many of them hold both the knowledge that astrology has not been scientifically validated and the genuine felt sense that it is useful. This is not contradiction. This is something more interesting.
The gold standard of empirical personality psychology is the Big Five model, or OCEAN: Openness to Experience, Conscientiousness, Extraversion, Agreeableness, and Neuroticism. Unlike astrology, unlike the Myers-Briggs, unlike the Enneagram, the Big Five emerged from decades of empirical research across cultures and is consistently validated by independent studies.
Where the Big Five differs from popular personality systems is in its fundamental premise. It does not sort you into a type. It places you on five independent continuous spectrums, and acknowledges that your position on each can shift over time and across contexts. A person can be high in openness and low in agreeableness. High in conscientiousness and high in neuroticism simultaneously. The model holds the complexity rather than collapsing it into a label.
The Myers-Briggs Type Indicator, which most people mean when they say "personality test," is a different beast entirely. Developed by Isabel Briggs Myers and her mother Katharine Cook Briggs with no formal psychology training, based on Carl Jung's theoretical framework, it has been consistently criticised for poor test-retest reliability. Take it twice, two weeks apart, and roughly half of people get a different result. The Big Five does not have this problem. The MBTI does, significantly.
"Personality tests satisfy both ends of the individuality-tribalism continuum. They offer an opportunity to reflect on our individual character while providing reassurance that our styles are shared by others." -- psychotherapist Dana Dorfman
In the 1940s, psychologist Bertram Forer gave his students identical personality descriptions and asked them to rate how accurate they were. The average rating was 4.26 out of 5. Everyone thought they had received a uniquely personalised reading. This phenomenon, now called the Barnum or Forer Effect, describes our tendency to accept vague, flattering, broadly applicable personality descriptions as specifically accurate to ourselves.
Both astrology and popular personality tests benefit significantly from this effect. The description of a Scorpio ("intense, perceptive, private, drawn to hidden things") applies to a broad enough range of people that most Scorpios will find it accurate. The description of an INFJ applies similarly broadly. What makes both feel revelatory is not their precision. It is the framing. When something appears to have examined you specifically and produced a conclusion, that conclusion feels more true than if you had read the same description in a different context.
Here is the thing: astrology and personality psychology are not competing to answer the same question. Astrology provides a narrative framework for understanding yourself across time, community for people who share a sign, and a language for talking about tendencies and patterns. It functions, for many people, as a meaning-making system more than a predictive one.
Psychology provides empirically tested tools for understanding how personality traits predict behaviour, life outcomes, and relationship patterns. At its best, it gives you reliable information about where you sit on measurable dimensions and what that means statistically.
You can use both without contradiction if you are clear about what each one is doing. The problem arises when astrology is treated as predictive science or when psychology is treated as the only valid form of self-knowledge. Both positions are overreach.
What both systems share, and why both remain so popular despite their respective limitations, is that they give people a way to talk about their inner lives in externalised, shareable form. "I'm a Gemini rising" and "I score high in openness and low in agreeableness" are both doing the same fundamental thing: converting something internal and complex into something that can be communicated, shared, and reflected back by others.
Astrology has experienced a significant cultural resurgence over the past decade, particularly among younger adults. The apps Co-Star and The Pattern have millions of users. Astrology content dominates certain corners of TikTok and Instagram. This resurgence happened at exactly the same time as significant cultural anxiety, institutional distrust, and the collapse of many of the traditional structures through which people used to make meaning.
This timing is not coincidental. Research consistently shows that people turn to systems of meaning and prediction during periods of uncertainty. Astrology offers the comfort of pattern, the sense that the chaos has a structure you can learn to read. That is a genuinely useful psychological function, regardless of whether the underlying mechanism is real.
The personality quiz functions similarly. In a world where your identity can feel fragmented across multiple social contexts and platforms, being told "you are The Unbothered Empress" or "you are a Capybara" is a small, playful act of consolidation. It is a moment of narrative coherence. You exist, you have a type, and other people who got the same result are out there right now, sharing it.