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Relationship astrology
Zodiac compatibility
Two signs, four kinds of relationship. Every pairing of the twelve signs, including a sign with itself, read for love, business, friendship and family, with the angle between them, their elements and rulers, and the Vedic matching rules shown alongside. A vocabulary for differences in pace and temperament, not a verdict on anyone.
- 78
- pairings
- 4
- kinds of relationship
- 12
- signs
Compatibility by sign
Start from your own sign to see all twelve of its pairings on one page.
The full table
Every pairing at a glance for the relationship you choose. Colours show how much friction the pairing usually carries, not whether it can work.
Flowing
Workable
Demanding
- Flowing
- Little built-in friction. The two share an element, a pace or a planetary friendship, and most of the work is keeping it from getting too comfortable.
- Workable
- Real differences, balanced by a clear way to divide the ground. Pairs that name who leads where tend to find the difference useful.
- Demanding
- Persistent friction in pace, temperament or values. Plenty of these pairings last; they take sustained, conscious effort from both people.
Four kinds of relationship
Love
Attraction, intimacy and life as a couple: what draws the two together, where their needs differ, and what a lasting version of the relationship looks like.
Business
Co-founders, colleagues, manager and report: how the two divide work, handle risk and money, and where their methods collide.
Friendship
What the two do together, how they fall out and what keeps the friendship going through the years when life pulls them apart.
Family
Households, siblings and adult family life, with a separate reading for each direction of the parent and child relationship.
How compatibility is read
The systems behind each pairing page, from the angle between two signs to the Vedic 36-point match.
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The angle between the signs
Western
Ptolemy, 2nd century
Count the signs between two partners and you get an aspect: same sign, neighbours, sextile, square, trine, quincunx or opposition. Trines and sextiles join signs of friendly elements; squares and oppositions join signs of the same mode that want different things; neighbours and quincunxes share almost nothing.
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Elements and modes
Western
Hellenistic
Fire and air feed each other, earth and water hold each other. Cardinal signs start, fixed signs sustain, mutable signs adapt. Two cardinal signs compete to lead; two fixed signs dig in; two mutable signs can drift for want of an anchor.
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Rulers and dignities
Western
Tetrabiblos
Each sign has a ruling planet, and each planet is strong or weak in the other signs. When one partner's ruler is exalted in the other's sign, or in its fall there, the tradition reads a built-in welcome or discomfort. Signs sharing a ruler, like Taurus and Libra, speak one planet's language in two accents.
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Antiscia
Western
Hellenistic
Signs that mirror each other across the solstice axis, such as Aries and Virgo, see equal lengths of day, and were said to 'behold' each other despite having nothing else in common. Mirrors across the equinox axis, such as Aries and Pisces, rise in equal times: these are the contra-antiscia.
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Synastry
Western
modern practice
The full method: laying two birth charts over each other and reading the aspects between planets. Venus and Mars contacts speak of attraction, Sun and Moon of recognition, Saturn of staying power. The sign pairing is the first, broadest layer of this comparison.
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Composite and Davison charts
Western
20th century
Charts for the relationship itself. The composite takes the midpoint of each pair of planets; the Davison chart is cast for the midpoint in time and place between two births. Both treat the couple as a third party with its own temperament.
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Ashtakoota matching
Vedic
Jyotisha
India's marriage-matching system scores two Moon signs and lunar mansions on eight counts for a maximum of 36 points, with 18 as the traditional threshold. Pairing pages show the two counts that depend on the sign alone: Bhakoot, the distance between the Moons, and Graha Maitri, the friendship of their ruling planets.
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Psychological astrology
Western
20th century
The Jungian reading, developed by Dane Rudhyar, Liz Greene and Stephen Arroyo: partners carry what we have not yet owned in ourselves. The seventh house and the opposite sign describe the qualities we look for in others, admire and resent, until we grow them in ourselves.
Two signs, four relationships
Most compatibility pages answer one question, whether two signs make a good couple. People also go into business together, share flats, raise children and stay friends for forty years, and the same two temperaments behave differently in each setting. A pairing that strains as a romance can split the work of a company neatly; two signs that fall in love easily can drive each other to distraction over a shared budget. Every pairing page here reads the two signs four times, for love, business, friendship and family, and gives the parent and child relationship in both directions, because an Aries parent with a Cancer child is a different story from a Cancer parent with an Aries child.
Seventy-eight pairings
Twelve signs make sixty-six pairs of different signs, plus twelve pairs of a sign with itself, seventy-eight in all. Same-sign couples are common and get their own pages: two Geminis talking past midnight and two Capricorns running a household like a well-audited firm have their own strengths and blind spots. Order does not matter, so Taurus and Aries is the same page as Aries and Taurus.
What sits under each pairing
The oldest layer is geometry. Two signs sit a fixed number of places apart, and that distance names an angle. Signs four apart share an element and form a trine, the easiest angle; signs three apart share a mode and form a square, the angle of friction; signs six apart face each other across the wheel in an opposition, the angle of attraction and projection. Neighbours and signs five apart share neither element nor mode and tend to find each other foreign.
On top of the geometry come the rulers. Aries and Scorpio share Mars; Taurus and Libra share Venus; Capricorn and Aquarius share Saturn in the traditional scheme. Some partners host each other's planets in dignity, as Capricorn hosts the exaltation of Mars, and some host them in weakness, as Cancer hosts the fall of Mars. Each pairing page lists these links so the reasoning is visible.
The Vedic reading
Indian astrology matches couples through the Ashtakoota system, which scores two Moon signs and their lunar mansions on eight counts for a maximum of 36 points. Two of those counts depend on the signs alone. Bhakoot measures the distance between the Moons: the 2-12, 5-9 and 6-8 positions are the traditional doshas, linked in the classical texts with money trouble, disagreement over children, and strife and ill health respectively. Graha Maitri asks whether the planets ruling the two Moon signs are natural friends, neutrals or enemies. The pairing pages show both results, with the reminder that they apply to Moon signs in the sidereal zodiac, not to the Sun signs most Western readers know.
Friction is not failure
Each reading carries an outlook: flowing, workable or demanding. It measures how much built-in friction a pairing usually carries in that kind of relationship, not whether it can succeed. Squares and oppositions produce many of astrology's most durable couples, precisely because the friction keeps both people awake. Flowing pairings have their own risk, which is comfort that turns into drift.
What the evidence says
Sun-sign compatibility has been tested against large samples, and the results are clear. The sociologist David Voas examined the birth dates of some ten million married couples in the 2001 census of England and Wales and found every sign combination occurring at the rate chance predicts. Studies of Michigan marriage and divorce records in 1971 and of Swedish population registers in 2020 found the same. In a double-blind test published in Nature in 1985, professional astrologers could not match birth charts to personality profiles better than chance.
This section is written with that in mind. The pairings are a symbolic vocabulary, centuries old and shared across cultures, for talking about differences in pace, temperament and need. Used that way they help people ask better questions about each other. They are not a reason to begin or end any relationship, and no pairing page should be read as a prediction.
Beyond the Sun sign
A sun-sign pairing is the broadest possible layer. Astrologers who compare two people in earnest look at the whole of both charts: the Moon for emotional needs, Venus and Mars for attraction, Mercury for how the two talk, Saturn for commitment, and the houses each planet falls in. Two people whose Sun signs clash may have Moons in the same element, and that changes the reading. The pairing pages note where a particular contact matters most for that pair.
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