It's ten to midnight, the windows are wide open because the July heat refuses to break, and your Hinge match is a Scorpio. You're a Gemini. You Googled "Scorpio Gemini compatibility" and the first result says "explosive combination, proceed with caution." You nearly didn't reply. Because yes, in 2025, we use astrology to filter our dates — and it's simultaneously ridiculous and fascinating.
You're in good company. In YouGov's January 2022 survey of the spiritual beliefs Britons hold, one woman in five (22%) said star signs probably or definitely have a genuine impact on a person's character and their compatibility with other people. Among men, it was 9%. So if you've ever wondered whether a match's star sign says anything about your chances, you're far from the only woman in Britain who has.
I know this story well. I've done it — before my current boyfriend, I dismissed profiles based on sun signs, over-read supposed incompatibilities, and watched supposedly "perfectly compatible" couples implode within six months.
The short answer first. A study of more than 66,000 Swedish marriages found no sign that "compatible" pairs marry each other more often or divorce less. What astrology has to offer on love lives elsewhere: in Venus, Mars, the Moon and synastry. Read them as a language for asking questions, not as a verdict.
The founding myth of sign compatibility
Sun sign compatibility is one of the most widespread — and most reductive — ideas in popular astrology. The basic premise: some signs "get along well" (Aries-Leo, Taurus-Virgo, Gemini-Libra). Others carry a reputation for incompatibility (Gemini-Scorpio, Virgo-Sagittarius and so on).
Where does this come from? Two main sources.
First, the theory of astrological elements. The four elements (Fire, Earth, Air, Water) form "families" of signs that share values and ways of operating. Two signs of the same element (or of complementary elements) would naturally understand each other.
Second, traditional astrological aspects. According to the standard definitions of astrological aspects, two signs in trine (120° apart, so the same element) are considered harmonious. Two signs in square (90°) or opposition (180°) are considered challenging.
The problem: this logic is applied only to the sun sign. Yet the Sun is just one point in a natal chart that also holds a Moon, a Rising sign, Venus, Mars, the other planets, the houses and every aspect between them. It's like judging the chemistry between two people by reading the date of birth on their passports, without ever meeting them.
And when researchers test sun sign compatibility on real couples? It collapses. Jonas Helgertz and Kirk Scott's 2020 study in the journal Genus took six compatibility schemes from astrology websites and set them against Swedish population registers from 1968 to 2001. That's 66,063 marriages to see who marries whom, and around 46,000 to follow divorces. The result: no consistent evidence that "compatible" couples are more common among the married, or that they divorce less.
What astrology says about love, beyond the sun sign
Chart-based astrology — the kind that takes the time to analyse two complete charts — doesn't say "these two people are incompatible." It says things like:
- "These two charts show a tension between one person's need for stability and the other's need for freedom. That's not insurmountable, but it will take conscious communication."
- "These two Venus placements are in trine: there's a natural aesthetic and emotional pull."
- "One person's Saturn is in a challenging aspect to the other's Sun. One of them may feel judged or held back."
All three of those sentences come from a synastry (comparing two complete charts): none of them can be read from two sun signs.
Honest astrology about love starts here: there's no "cursed" sign combination and no "guaranteed happy" one. What makes a couple last is something researchers have been measuring for decades. Research by John Gottman and Robert Levenson found that most relationship problems (69%) never get resolved: they're "perpetual" problems based on personality differences between partners. What predicts a break-up is the way you argue — the pattern Gottman calls the Four Horsemen: criticism, defensiveness, contempt and stonewalling.
Astrology can shed light on those dynamics. It doesn't decide them. And if it's the way the two of you talk that keeps going wrong, couple communication techniques that actually work will help far more than any compatibility table.
The astrological elements and natural affinities
While sun sign compatibility is too reductive, element theory offers a more interesting framework. As long as you don't treat it as an absolute rule.
The twelve signs divide into four elements of three signs each:
- Fire: Aries, Leo, Sagittarius — act first, think later. These signs need space and a bit of adventure.
- Earth: Taurus, Virgo, Capricorn — concrete, sensory, and in need of a security that isn't up for negotiation.
- Air: Gemini, Libra, Aquarius — signs that think out loud (take away the mental stimulation and the freedom, and they fade).
- Water: Cancer, Scorpio, Pisces — emotion and intuition lead; intimacy comes before everything else.
The classical theory: signs of the same element understand each other naturally, and complementary elements harmonise well (Fire-Air, Earth-Water). The "difficult" combinations would be Fire-Water and Earth-Air, and more broadly any pair of elements that don't complement each other, such as Air-Water or Fire-Earth.
In practice, it's more nuanced. Fire and Water can create a powerful alchemy: the passion of Fire meets the emotional depth of Water. Earth and Air can complement each other — Earth's stability grounds Air's ideas.
The classic compatibility table, sign by sign
Here's what tradition says for each sign — and what the Swedish registers made of grids like this one: nothing measurable. The table follows the geometry of the zodiac. Signs in trine (same element) are billed as the easiest match, signs in sextile as complementary, signs in square as the most strained. That leaves the opposite sign, which tradition files under tension and which plenty of astrologers also read as attraction.
| Sign | Classic affinities (same element, trine) | Complementary (sextile) | Classic tensions (square) | Opposite sign |
|---|---|---|---|---|
| Aries | Leo, Sagittarius | Gemini, Aquarius | Cancer, Capricorn | Libra |
| Taurus | Virgo, Capricorn | Cancer, Pisces | Leo, Aquarius | Scorpio |
| Gemini | Libra, Aquarius | Leo, Aries | Virgo, Pisces | Sagittarius |
| Cancer | Scorpio, Pisces | Virgo, Taurus | Libra, Aries | Capricorn |
| Leo | Sagittarius, Aries | Libra, Gemini | Scorpio, Taurus | Aquarius |
| Virgo | Capricorn, Taurus | Scorpio, Cancer | Sagittarius, Gemini | Pisces |
| Libra | Aquarius, Gemini | Sagittarius, Leo | Capricorn, Cancer | Aries |
| Scorpio | Pisces, Cancer | Capricorn, Virgo | Aquarius, Leo | Taurus |
| Sagittarius | Aries, Leo | Aquarius, Libra | Pisces, Virgo | Gemini |
| Capricorn | Taurus, Virgo | Pisces, Scorpio | Aries, Libra | Cancer |
| Aquarius | Gemini, Libra | Aries, Sagittarius | Taurus, Scorpio | Leo |
| Pisces | Cancer, Scorpio | Taurus, Capricorn | Gemini, Sagittarius | Virgo |
To use it, read your row, then theirs. Landing in the tensions column says nothing about your future: it only says your Suns sit 90° apart. In Helgertz and Scott's Swedish study, there was no consistent evidence that couples rated compatible by the grids on astrology websites married more often or divorced less.
While you're there, look for Scorpio in Gemini's row: it isn't in it. The two signs are 150° apart, a quincunx, which the classic grid counts as neither a harmony nor a clash. Their reputation for incompatibility comes from popular tables, not from the geometry of aspects (the same goes for Cancer and Aquarius).
Astrological modalities (cardinal, fixed, mutable) in a couple
Modality describes how each of you steers a relationship: who starts things, who holds on, who adapts. Less well known than the elements, it also splits the twelve signs, this time into three groups of four:
- Cardinal: Aries, Cancer, Libra, Capricorn — the starters. A project, a difficult conversation, a last-minute weekend away: it comes from them.
- Fixed: Taurus, Leo, Scorpio, Aquarius — they finish what they start, and hate it when the plan changes halfway.
- Mutable: Gemini, Virgo, Sagittarius, Pisces — maximum flexibility, variable consistency (depending on the day).
Two Fixed signs together (Taurus-Scorpio, for example) can be remarkably stable and loyal. Or two immovable objects who never yield. Two Mutable signs (Gemini-Sagittarius) adapt easily to each other — or drift for want of structure.
The pairing that often works best: one Cardinal and one Fixed. One starts things, the other anchors and builds. Two Cardinals, on the other hand, can trip over each other, both wanting to steer.
Venus and Mars: the planets astrologers check first
If you want to use astrology to understand a romantic dynamic, Venus and Mars are the planets to look at first. Long before the sun sign.
Venus: what we seek in love
Venus represents your way of loving, what you find beautiful, attractive and desirable, and what you offer in love. It also governs your aesthetic taste and your relationship with pleasure and ease.
You don't need twelve portraits to start: the element of your Venus and of theirs already tells you what each of you expects from the other, and where it's likely to rub.
- Venus in Fire (Aries, Leo, Sagittarius) — wants to be chased, admired, surprised. The sticking point: routine, which it quickly mistakes for falling out of love.
- Venus in Earth (Taurus, Virgo, Capricorn) — proof rather than promises. A home-cooked dinner beats any declaration, and an unpredictable partner makes it close up.
- Venus in Air (Gemini, Libra, Aquarius) — conversation first. When the talking dries up, so does the desire, and being asked to account for itself feels suffocating.
- Venus in Water (Cancer, Scorpio, Pisces) — it's all or nothing. It needs to feel like the only person in the world, and the slightest distance sows doubt.
Mars: how we express desire
Mars represents how you desire, how you fight for what you want, and your sexual energy. In a romantic dynamic, Mars speaks to physical attraction and romantic tension.
The Venus-Mars match between two people is often more revealing than Sun-Sun for understanding attraction. Mars in Scorpio meeting Venus in Scorpio: magnetic, intense attraction. Mars in Aries meeting Venus in Libra: tension between impulsivity and the need for harmony. Explosive or complementary, depending on the rest of the chart.
Synastry: comparing two full charts
Synastry (from the Greek syn, together, and astron, star) is the branch of astrology that studies a relationship by overlaying two natal charts. It's the most complete tool astrology offers for reading couple dynamics.
The principle: each planet in one chart forms aspects with the planets in the other. Those aspects map the zones of attraction, tension, support and friction in the relationship.
A few synastry aspects astrologers look at first:
- One person's Sun conjunct the other's Moon: a classic of long-term relationships. One person's identity answers the other's deepest needs.
- Venus-Venus in harmonious aspect (trine, sextile): natural aesthetic and emotional harmony.
- One person's Mars conjunct the other's Venus: strong physical attraction, the textbook sign of romantic chemistry.
- One person's Saturn aspecting the other's Sun: can be stabilising — or feel like a permanent limit, depending on the aspect.
- One person's Pluto aspecting the other's Sun: an intense, transformative relationship, the life-changing kind, for better or worse.
- One person's North Node conjunct the other's Sun: often read as a "karmic" connection. The lunar nodes are also the points behind eclipses and what they mean in astrology.
To be useful, a synastry needs the date, time and place of birth for both people: without the time, the Rising sign and houses aren't reliable. A chart calculation site such as Astro.com then overlays the two charts. The reading itself takes patience — or an astrologer who reads both charts with you.
Scorpio-Gemini, Virgo-Sagittarius: the "incompatible" couples that last
If sun sign compatibility were a rule, these pairings wouldn't exist. Here's how chart-based astrology explains them.
Scorpio-Gemini: branded incompatible by popular tables — Air and Water, 150° apart (a quincunx, or inconjunct: neither a trine nor a square). One is deep and intense, the other light and changeable (the full portrait is in our guide to the Gemini star sign, its personality and best matches). For an astrologer reading the synastry, the key often lies elsewhere: a Venus in Cancer (a Water sign, like Scorpio) in the Gemini's chart, or a Moon in an Air sign in the Scorpio's, building bridges the sun signs alone don't show.
Virgo-Sagittarius: in square, so supposedly locked in constant tension. On paper, though, Virgo's precision and Sagittarius's expansiveness fit together well — one brings rigour, the other enthusiasm.
Cancer-Aquarius: the emotional meets the detached. Tricky on the surface. But if the Aquarius has a Moon in Cancer or Pisces, or the Cancer has planets in Aquarius or Gemini, the picture changes completely.
That's the astrological reading. The statistical one is even simpler: in the Swedish registers studied by Helgertz and Scott, "incompatible" couples didn't divorce more often than anyone else. So there are no exceptions to explain. The rule itself doesn't hold.
Using astrology healthily in relationships
Astrology helps a couple when it opens a conversation, and harms it when it makes the decision for you.
What helps:
- Using astrology to better understand your own needs in love (Venus, Moon, 7th House).
- Using it to open a conversation: "I've got Saturn opposing your Sun — do you ever feel like I'm judging you?" If it rings true, you're talking.
- Spotting patterns without setting them in stone: "This is what we tend to replay. How do we stop it becoming toxic?"
- Making it something you share. Comparing your Venus placements over a drink in a beer garden on a summer evening counts as a date (and it's one more idea for reigniting the spark in your relationship without the clichés).
- Staying curious about the other person without reducing them to their sign.
What doesn't help:
- Rejecting someone purely because of their sun sign.
- Using astrology to excuse problematic behaviour: "It's just my Scorpio being jealous, it's normal."
- Treating "incompatibilities" as prophecies.
- Making a major decision (ending things, committing) based solely on a synastry reading.
Arguments are part of the deal anyway. Relate's advice for couples who can't stop arguing starts from a reassuring point: "Some degree of conflict can even be healthy, as it means both people are expressing themselves, rather than keeping everything inside and letting emotions fester." The patterns it tells you to avoid will sound familiar — stonewalling, criticism, contempt, defensiveness. And if the same rows keep coming back, couples therapy, and when and how to seek it, offers something no birth chart can: a third person helping you both talk.
Social media compatibility rankings: what they're worth
The compatibility rankings doing the rounds on social media are worth very little as a guide to your love life: they only look at the sun sign. The three best matches for Aquarius, Virgo's worst romantic enemy… you've scrolled past them.
These posts rest on sun sign archetypes alone, generalise dynamics that depend on countless factors, and often mix legitimate astrological ideas with claims built for clicks.
What they do well: introduce certain archetypes (the intense Scorpio, the free-spirited Sagittarius, the analytical Virgo) and get conversations going. It's astrology as entertainment. The problem starts when we give them predictive power they don't have. Social media already weighs heavily enough on self-esteem, according to the research; there's no need to hand it your love life too.
Frequently asked questions
Are Cancer and Capricorn opposites in love?
In astrology, Cancer and Capricorn are opposite signs (180° apart in the zodiac): they represent complementary principles, sometimes in tension. Cancer seeks emotional warmth and home; Capricorn seeks mastery and structure. Many astrologers read that opposition as attraction, and often as deep complementarity. It's not an incompatibility.
Why am I attracted to supposedly incompatible signs?
Several reasons. First, attraction doesn't come down to sun signs: Venus, Mars, the Moon and the Rising sign all carry huge weight in an astrological reading. Second, elemental "incompatibilities" (Fire-Water, Earth-Air) describe possible tensions, and tension can be attractive. Third, the Swedish study of more than 66,000 marriages found no link between sun sign compatibility and divorce: your attraction has no reason to follow the tables.
My synastry with my ex was perfect. Why didn't it work?
Because a "perfect" synastry doesn't exist, and even a very good one describes potential, not destiny. Harmonious aspects make some things easier, but they don't make up for mismatched values, communication needs or life goals. A "difficult" synastry can produce a wonderful relationship if both people have the maturity to work through its tensions.
Is there a "worst" sign for me?
No. There's no "cursed" sign for anyone. Some dynamics are easier than others depending on the complete charts — but "easy" isn't the same as "better." Some very strong relationships are built on real tensions, because those tensions force you both to grow. The real question is more like: who do I want to take on that complexity with?
What do I need to create a synastry chart?
The date, time and place of birth for both people. The time matters enormously: without it, the Rising sign and houses are guesswork. A chart calculation site such as Astro.com then overlays both charts in a single diagram and marks the aspects between one person's planets and the other's. The diagram alone is informative once you know the basics of aspects; the full reading remains an art.
Water signs and Fire signs: incompatible?
In the table, no Fire-Water pair is in trine or sextile: Aries-Cancer, Leo-Scorpio and Sagittarius-Pisces are in square; the other pairs sit 30° or 150° apart. That geometry is what feeds the reputation — and the Swedish study found no more divorces among couples the grids rated poorly.
Can astrological compatibility with someone change over time?
Natal charts are fixed: they describe where the planets were at the moment of birth. The way we live those dynamics, though, evolves with age and self-awareness. A Saturn-Mars square in a synastry might mean constant conflict at 25, without any inner work. The same square at 40, between two people who know themselves better, can become a source of shared structure and drive.
Sources and references
- YouGov — Positive vibrations, chakras and star signs: what spiritual beliefs do Britons hold? (January 2022)
- Helgertz and Scott — The validity of astrological predictions on marriage and divorce, Genus, 2020
- The Gottman Institute — Research (John Gottman and Robert Levenson)
- Relate — We can't stop arguing
- Wikipedia — Astrological aspect