The Composite Chart is an astrological method combining two natal horoscopes into a single new chart representing the relationship as an entity. For each planet and point, the nearer midpoint between the two partners' positions is calculated using . The result is an entirely new chart with its own Sun, Moon, Venus, Mars, Ascendant and houses — a chart describing the relationship's identity, emotional tone, love style, public image and key challenges. The interpretation analyzes specific aspects between composite planets and provides practical advice for the specific couple.
Where it comes from
The composite chart came out of mid-twentieth-century work on midpoints, particularly the German Uranian school, and was brought into relationship astrology by Robert Hand and John Townley in the 1970s. The idea that separated it from earlier comparison methods is that a relationship is not just two people reacting to each other but a third thing with a chart of its own.
How the method works
For every planet and angle, the nearer midpoint between the two natal positions is taken: a Sun at 10° Aries and a Sun at 20° Gemini give a composite Sun at 15° Taurus. Doing this for the whole chart produces a new set of positions with its own aspects, which is the point — planets that were unaspected in both natal charts can form a tight square in the composite, and that square is read as belonging to the relationship rather than to either person. The angles are the awkward part: they depend on both birth times, so an unreliable time in either chart makes the composite houses unreliable, and practitioners disagree on whether to take the midpoint of the angles or to recompute them from a midpoint location.
What a reading covers
A reading gives the composite Sun, Moon, Venus, Mars, Ascendant and houses, the aspects between composite planets, and a reading of what the chart says about the relationship's identity, emotional tone, style of affection and recurring difficulty.
Common questions
- How is this different from synastry?
- Synastry compares the two charts to each other and describes what each person does to the other. The composite merges them into one chart and describes the relationship as a unit. Most practitioners read both.
- Do we both need exact birth times?
- For the planets, approximate times are workable. For the Ascendant and the houses, both times need to be reliable, and if one is not the reading is limited to the planetary picture.
- Does it work for non-romantic relationships?
- Yes. The method makes no assumption about the kind of bond and is used for business partners, co-parents and long friendships as readily as for couples.