Astrology has many uses and techniques; one of the most popular uses is synastry, which is the term to describe how two charts interact with each other. We all have the same points in our charts: the Sun in a sign, the Moon in a sign, Mercury in a sign, and so on. When we get together with someone our energy designs (our charts) interact.
This article is one of a series to look at the interaction of points between two people and explain how to interpret the dynamics between points in different charts. A Composite Chart is a singular chart you create as a couple when your charts are merged together by calculating the midpoint between each of the matching Points in two charts.
What is Synastry Astrology?
It is probably easier to show it visually rather than write a lengthy explanation. Below you will see a single image of two charts, one on the inside and another going around the outside. There are two images to show what the relationship looks like when person A is on the inside and person B is on the outside, then the reverse.
These were randomly generated charts. As you can see, all the same points appear in different signs throughout the two charts. When we look at them together, we have the chance to see the kinds of energy dynamics that will take effect when they form a connection, whether as lovers, friends, or family members.
Reading the Synastry of Two People
A fair amount of my work as a professional astrologer involves relationship chart reading, and I always start with the Moons and work my way through the other points. Often clients, or people I meet in public, who find out I am an astrologer, will say something like, “I am a Leo and read somewhere that I should never date a Scorpio” or “I am a Leo and should only date fire and air signs, like Aries or Gemini”. Then they ask, “is that true?”
While it is true that some signs challenge one another and others flow, any sign can “get along” with another sign depending on the maturity of the individuals. There are certainly plenty of examples of successful and happy Leo/Scorpio couples and failed Aries/Leo couples. The signs do not guarantee success or failure, they just reveal how energy will generally interact in any relationship.
Please keep in mind that flowing energy is not the same as positive energy. Flow occurs when two points aspect or align with each other in certain ways and close to the same degree. For example, if I have my Mercury in Leo at 12 degrees and you have your Mercury in Aries at 13 degrees, our Mercury’s will trine and easily flow since they are both in fire signs.
That is great if we communicate well and positively with our fiery approach, but not so great if one or both of us chooses to be argumentative all the time, picking verbal fights constantly. And no matter how problematic the communication energy between us, the flow will keep us communicating and trying to “win” our points whether the relationship is healthy or not.
Synastry Astrology: Vesta to Vesta – How We Live Together
Combining Two Charts to Create One Chart
There are two main ways to combine astrology charts: the midpoint method, known as the Composite chart, and the geographic method, known as the Davison chart. This article will focus on the Composite chart. In the next section, you will be able to see the Composite chart for Person A and B. This chart reflects the energetic entity the two people become when they are together. The Composite chart exists for any connection between two people, so there can be a Composite chart for parents and children, co-workers, and friendships.
The Energy Between Us: A Guide to Composite Charts
Below is the composite chart of the two charts above:
When you combine the charts, the Couple ends up with the Sun Leo at 15 degrees and 01 minutes in the 3rd House of Communication. The combined Moon is 12d33m of Capricorn and the Ascendant is 22d14m of Gemini. The Primary Triad for this couple could be stated as, “Their Life Path needs to be adventurous and filled with dynamic interactions with the people around them, as social leaders. At the heart (Moon) of the relationship is the Soul Urge to succeed together as a couple. People will perceive them together as open-minded and curious, the type of couple everyone likes to communicate with.”
The Couple Chart and Each Person
To do a complete and comprehensive reading for any two people, you want to look at the synastry charts – Person A to Person B and Person B to Person A, the combined charts – Composite and Davison, and the combined charts to Person A and Person B. Below are the charts of the Composite chart with Person A’s chart, then Person B’s chart.
It would be easy to write a long report on each part of the review. Each section could become a book. But due to real-world limits for these articles (around 1,000 words), we’ll focus on the standout chart points. And, quite synchronistically, there’s a major aspect involving the Moon in the Composite chart. It connects with an impersonal point in each person’s natal chart.
For Person A, the Moon in the Composite chart sits directly on Jupiter in the 7th House of Partnership. This means the heart of the relationship helps Person A grow. It also connects them with others in the world (7th House), especially those who help reach their goals (Capricorn). Even if the relationship doesn’t last, their shared emotional energy boosts Person A’s drive. Because this is a conjunction, the experience may be loving—or challenging. Either way, it matters deeply. The emotional charge in this connection will leave a mark. Growth is part of the journey, no matter how it unfolds.
Synastry Astrology: Juno to Juno – How We Commit
When the Moon Meets Neptune
For Person B, the Moon in the Composite chart sits directly on Neptune in the 8th House of Intimacy and Shared Resources. The “heart” of this bond helps Person B understand and truly feel their deeper purpose (Neptune). This is especially true in how they relate to the partnership and how they’ll grow and succeed (Capricorn) together (8th House).
Again, this is a conjunction with an impersonal point. That means the outcome—positive or negative—isn’t defined. It’s not like a square (which brings challenge) or a trine (which supports flow). This one will depend on how the energy plays out in real time.
Sometimes, a Composite chart leans more toward one person energetically. In this case, the charts highlight a strong aspect favoring Person B. The Sun in the Composite chart is conjunct Person B’s natal Jupiter, sitting in the 3rd House and in Leo.
In traditional astrology, Jupiter is the Greater Benefic. So, with the relationship’s Sun pouring energy into it, Person B receives a radiant boost—especially in the presence of Person A.
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