Here at Astrology SA we’ve guided thousands of individuals—from seasoned enthusiasts to those just beginning their journey—through their most pressing questions. And one question that echoes louder than all the others, often dominating the conversations is: “Are we compatible?”

It’s a question that often starts with our Sun signs. “We’re a Capricorn and an Aries. Can this ever work?”    

We’ve all been there. We’ve all scrolled through articles that deliver a simple “yes” or “no” based on our zodiac signs. And we’ve all felt that confusing sting when a “perfect” match—like a dreamy Pisces and a grounded Taurus —ends in a way that makes no sense. Conversely, we all know one of those “impossible” couples, like a sensitive Cancer and a freedom-loving Sagittarius, who have been inexplicably, blissfully happy for 30 years.   

This paradox is the universe’s way of telling our entire community something vital: we are asking the wrong question.

The problem with “Are we compatible?” is that it’s a pass/fail question. It’s a dead end. It doesn’t offer any room for growth, understanding, or the personal evolution that leads to karmic unity. It keeps us stuck in a surface-level analysis that ignores the most magical and mysterious part of any partnership.

It’s time for an upgrade. It’s time for all of us to stop asking if we’re compatible and start asking a much more profound, insightful, and empowering question:

“What is our relationship’s zodiac sign?”

Yes, you read that right. Your relationship has its own unique natal chart. It’s the secret to understanding not just if you’ll get along, but why you are together in the first place.

The “Compatibility Trap”: Why We Get Stuck

Before we get to the solution, let’s break down the problem. When most people (even experienced astrologers) look at relationship dynamics, they are using a technique called Synastry.   

Synastry is the art of comparison. It takes your natal chart and lays it directly on top of your partner’s chart, creating a “bi-wheel”. This method is incredibly valuable, but it only tells one part of the story.   

Synastry answers the “you vs. me” questions:

• “How does my Mars (planet of action) trigger their Venus (planet of love)?”    
• “Does their Jupiter (planet of expansion) fall in my 7th House (of partnership)?”    
• “Why do I feel so energized/agitated/understood when I’m around them?”

Synastry is the chart of chemistry. It shows the sparks, the friction, and the immediate impact two people have on each other.   

But here’s its critical limitation: Synastry cannot tell you the purpose of the relationship itself. It only shows how two individuals interact. This is why Synastry charts can be so confusing. A chart might show one person having a “fated soulmate” experience, while the other person feels “triggered and constrained”.   

A relationship is more than just two people interacting. When two people come together, they create a new, living, breathing “third entity”.   

This third entity is the “us.” And that “us” has its own mission, its own emotional needs, its own destiny, and its very own natal chart.

The Astrological Breakthrough: The Composite Chart

In astrology, this “third entity” chart is called the Composite Chart.   

Unlike Synastry, which just compares two charts, the Composite Chart blends them. It’s a new, single chart created by finding the mathematical midpoint between your planets and your partner’s planets.   

• Your Sun and your partner’s Sun combine to create a new Composite Sun.
• Your Moon and your partner’s Moon combine to create a new Composite Moon.
• Your Venus and your partner’s Venus combine to create a new Composite Venus.

…and so on for every planet.   

This new chart is the natal chart of your relationship. It is the roadmap for the “us.” It answers the questions that truly matter for long-term growth and clarity:

• “What is the core purpose of this relationship?” (Composite Sun)    
• “What does the relationship itself need to feel emotionally secure?” (Composite Moon)    
• “What is our shared love language?” (Composite Venus)    
• “What is the ‘work’ we are here to do together?” (Composite Saturn)    

This is the shift from “compatibility” to purpose.

What Your Relationship’s Zodiac Sign Reveals

The most powerful placement in this new chart is the Composite Sun. This is, quite literally, your “relationship’s zodiac sign”. It reveals the core identity, purpose, and life-force of your partnership.   

Let’s look at a few examples:

• A “Cancer” Relationship (Composite Sun in Cancer): The core purpose of this relationship is to create security, nurturing, and a shared sense of “home”. This is a bond that needs to be private and emotionally safe. Its “work” is to build a family or a sanctuary together. It thrives on emotional honesty and will crumble if that security is threatened.   
• An “Aries” Relationship (Composite Sun in Aries): This is a partnership of action, passion, and new beginnings. The purpose is to pioneer, to be brave, and to push each other into new territory. It’s a dynamic, fiery bond that needs a shared mission, or that fire can turn inward and become conflict.   
• A “Libra” Relationship (Composite Sun in Libra): This relationship’s purpose is to create harmony, beauty, and balance. It is a “power couple” in the social sense, often focused on art, justice, or partnership itself. It needs to feel fair and equal, and its greatest challenge is avoiding conflict just to “keep the peace.”   
• A “Capricorn” Relationship (Composite Sun in Capricorn): This is a partnership built to last. Its purpose is structure, legacy, and real-world achievement. This is the “power couple” that builds an empire, a business, or a lasting family structure. It needs respect and shared goals, and it finds intimacy through mutual ambition and dependability.   

Suddenly, the “impossible” couple makes sense. That “incompatible” Cancer and Sagittarius  might have a Composite Sun in Libra. Individually, they are totally different. But the relationship itself (the “us”) is a harmonious Libra entity, teaching them both how to live in balance.   

And that “perfect” Pisces and Taurus? Their charts may have revealed a Composite Sun in Gemini. They looked stable, but their relationship’s purpose was to be social, communicative, and to experience variety. When they tried to force it into a quiet, stable box, the relationship suffocated.   

This is why this tool is so vital for personal growth. It stops us from blaming ourselves or our partners for “incompatibility” and instead helps us understand what the relationship itself is asking of us.   

This Isn’t Just for Romance

This profound tool isn’t limited to romantic partners. As astrologers, we’ve used the Composite Chart to bring radical clarity to all kinds of dynamics.   

Business Partnerships: This is a game-changer for entrepreneurs. The Composite Chart is the “natal chart” of your company.   

• Does your business have a Composite Sun in Aquarius? Its purpose is innovation, community, and forward-thinking.   
• Does it have a Composite Mercury in Scorpio? Its communication style will be deep, penetrating, and investigative.   
• Knowing this helps align brand messaging, manage team dynamics, and understand a company’s “karmic mission”.   

Family Dynamics: Running a Composite Chart with a parent or sibling can be an incredible tool for healing. It allows you to see the shared “karmic lessons” your souls agreed to work on together in this lifetime.   

Friendships: It can explain why one friend is your “adventure buddy” (perhaps a Sagittarius Composite Sun) while another is your “emotional rock” (a Cancer Composite Moon).

Your Path to Clarity

Shifting our collective perspective from “Are we compatible?” to “What is our shared purpose?” is the single most empowering step we can take in our relationships. It moves us from a place of fear-based judgment to one of co-creative, conscious partnership.

This is an advanced, powerful technique, and truly mastering it can be the key to unlocking the soul-level contracts in your life.

Here at Astrology SA, we are deeply committed to providing our community with the most effective tools for growth. When it comes to mastering the Composite Chart, our most trusted resource comes from the world-renowned astrologers, The AstroTwins, Tali and Ophira Edut. They are the official astrologers for ELLE magazine and were the matchmakers on the Amazon Prime Video series, Cosmic Love.   

They have created the definitive system for this technique, which they call the “Supercouple Chart”. Their #1 best-selling book is, in our professional opinion, the most comprehensive and accessible guide ever written on the subject. For those ready to decode their own relationship’s zodiac sign, we recommend their book, Supercouple: Astrology Secrets for a Sexy, Soulful & Satisfying Relationship.

Understanding the “third entity” you create with another person is transformative. It gives you an instruction manual for your connection , helping you navigate the hard stuff with more grace and amplify the magic you were always meant to build together.   

Stop searching for a simple “yes” or “no.” You are here for something far greater than mere compatibility. You are here to learn, to grow, and to build something new.

Now, you have the right question. Go find your answer.

Frequently Asked Questions (FAQs)

1. What is the main difference between a Synastry chart and a Composite Chart? A Synastry chart is the most common compatibility report. It works by laying one person’s individual birth chart on top of the other’s to see how they interact. This is excellent for seeing the “chemistry” or “friction” between two people—a “you vs. me” dynamic. A Composite Chart is different: it blends the two charts by calculating the mathematical midpoints of all the planets. This creates a single, new chart that represents the relationship itself as its own “third entity,” revealing the shared “us” and its true purpose.  

2. How is a Composite Chart calculated? The Composite Chart is a separate chart calculated using the mathematical midpoints between each pair of planets from two charts. For example, if one person’s Sun is at 10 degrees of Aries and their partner’s Sun is at 10 degrees of Gemini, the Composite Sun (the “relationship’s sign”) would be at 10 degrees of Taurus, the exact midpoint. This process is repeated for the Moon, Mercury, Venus, and all other planets, creating a brand-new chart for the partnership.  

3. What if my partner and I have “bad” Synastry? Does a good Composite Chart matter more? This is a very common concern, and many modern astrologers place greater weight on the Composite Chart for long-term potential. You can have “perfect” Synastry, but if the Composite Chart is full of challenges, the relationship itself will struggle to function as a unit. Conversely, a strong and harmonious Composite Chart is often powerful enough to override difficult Synastry. The tough Synastry might describe your initial friction, but the good Composite Chart shows that the purpose of your bond is strong enough to work through it.  

4. Can I use a Composite Chart for non-romantic relationships? Absolutely. The Composite Chart is a powerful tool for understanding the dynamics of any partnership. It is especially useful for business partners, as it can reveal the shared mission, public image (from the Composite Ascendant), and financial style of the business entity itself. It also provides incredible insights into dynamics with family members, co-founders, and close friends.  

5. This is fascinating. How can I find my relationship’s zodiac sign? The “relationship’s zodiac sign” is simply the Sun sign of your Composite Chart. While some astrology software can be complex, the most straightforward system we’ve found is from The AstroTwins. Their Supercouple hub provides a free “Supercouple chart calculator” that instantly generates your composite placements. For a complete guide on how to read it, their #1 best-selling book, Supercouple, is the definitive resource we recommend.