Most people are familiar with the concept of compatibility in astrology. "I'm an Aries, he's a Cancer; are we a good match?" Person A's astrological chart is then compared to Person B's chart to determine how easy or difficult it will be to get along, understand each other, and have great sex. Then much giggling or moaning commences upon looking at each chart overlaid on the other. Once a relationship is established, for better or worse, it can seem to take on a life of its own! What you and another person create together can sometimes be very different from your own natures or even what you'd imagined the two of you would be like together.
Anything that has a birth has a birth chart, be it dog, person, or country, relationships included. The composite chart is just that: the birth chart of a relationship.
With people, it's not usually difficult to tell when they are born. Even if no one noted the time of birth, or even the day, the moment of birth is typically clear, give or take a few minutes. Relationship birth dates, like countries, may seem more challenging on first thought. When did this relationship begin? The first date? When we became monogamous? When we said "I love you?"
Composite charts use the moment of the first meeting between two people as the relationship's birth. As long as two people are conscious of each other, even if it's just for the moment of introductions or hellos, and even if nothing comes of the meeting until much later, that moment is the birth of a relationship where astrology is concerned. Talk about premature commitment!
Obviously not every meeting results in a notable relationship. One could meet the President of the United States once and a composite chart could be drawn up from that meeting; it certainly doesn't mean you're going to exchange vows or anything else but a handshake! Like an instruction manual, it's only useful if you plan on actually using the, uh, equipment more than once or twice.
Technique: Creating a Composite Chart
Obviously, since the chart is a circle, there are two midpoints between each planet's placements. In the above example, the longer way around the circle from Virgo to Capricorn would land in Taurus. Composite technique uses the shortest midpoint between two planets.
The composite chart has its own houses as well. House cusps in a natal chart are calculated based on one's birth location on earth, but with two different birth locations of two different people creating two different ascendants and so on, the house cusp calculation for composite charts can be trickier. There are a couple of ways to calculate house cusps in composite charts:
Interpreting the Composite Chart
Looking briefly at an example, above is the composite chart of two people in a deeply committed friendship. The wealth of Aries planets in the first house reveals that the core needs of this relationship revolve around developing Aries qualities: initiative, directness, impulsiveness, and passion. The first house shows that the relationship is very self-focused and needs that time and attention to feel that its needs come first. The tightest portion of these planets lies in the conjunction between the Sun, Moon, and Mercury, suggesting the high importance of forthright communication.
With Neptune in the eighth house and being the chart ruler with the Ascendant in Pisces, the relationship may not always be what it appears. There is a gentleness and lightheartedness that may belie the intensity of the bond. Pluto right on the descendant reveals that other people may seem to represent a great threat to the relationship but can also be greatly transformative, causing the relationship to grow in ways it might not otherwise. Uranus here also seems to indicate that this relationship may not reflect the standard rules for what a relationship is expected to be. This can be a good thing as the relationship develops and trusts its uniqueness so it can develop longevity, which is something the relationship ultimately is aiming for with the north node in the eleventh house of the future.
Naturally, it is best to consider the natal chart of each person thoroughly before assessing the composite chart. A brief vignette of chart highlights reveals that Person A likes a lot of time alone, has a deep sense of duty to protect their partner, yet has high, unrealized, and unspoken expectations of a partner. Person B entered the relationship with a tendency toward too much people pleasing and a difficulty asking for what they want and accepting support. This composite chart poses a challenge for them both, since Person A tended to avoid confrontation and didn't consciously realize their own expectations easily, and Person B never wanted to appear selfish or confrontational.
As these two people have refined their relationship, the necessity for honest communication and for each individual to stand up for themselves has become very apparent. They have risen to the challenge within the context of friendship and their bond has become seemingly unbreakable as a result, with direct and frequent communication being the cornerstone.
It should be noted that composite charts are a special breed based on midpoint theory, but they are not the only astrological method used to examine a relationship. Outside of midpoints, one can certainly look at the chart for a marriage, or the chart of the first meeting, by simply calculating these charts in the usual way, as if they were natal charts for people. As with almost everything in astrology, there are multiple points of view and they all have a technique to go along with them, so take your pick!
Amy Herring (Shoreline, Washington) has been a consultant and teacher of astrology since 1995. A graduate of Steven Forrest's Evolutionary Astrology Apprenticeship program, her articles have appeared in various astrology ...