Composite Chart

A composite chart is a single chart that represents a relationship as its own entity. It is created by calculating the midpoints between two people’s planetary positions, producing one unified horoscope for the partnership rather than for either individual. This makes it a direct read of the core nature, themes, and direction of a relationship.

Access

Open the composite chart from the chart-type dropdown.

1. Make sure both people have birth data registered
2. On the chart page, open the chart-type dropdown
3. Select “Composite Chart”
4. Pick the two partners in the partner picker (the same picker used for synastry)

Which method is used

HOSHIDOU’s composite uses the midpoint method. Each composite planet sits at the midpoint of the two people’s planetary longitudes for that body.

The alternative Davison composite (one chart cast for the midpoint in time and space between the two birth events) is not currently supported.

How midpoints are calculated

Each planet in the composite chart is placed at the averaged position of that same planet in both people’s natal charts. For example, if Person A’s Sun is at 10° Aries and Person B’s Sun is at 20° Aries, the composite Sun lands at 15° Aries.

This calculation is applied to every planet and sensitive point in both charts. The resulting set of midpoints is then plotted onto a single wheel, giving the relationship its own complete horoscope with signs, houses, and aspects.

Choosing a partner

To create a composite chart, you need birth data for two people. The partner selection screen uses the same interface as the synastry chart — pick two entries from your saved birth data list and the composite chart is generated instantly.

How it differs from synastry

Both synastry and composite charts analyze relationships, but they approach the task from different angles.

• Synastry - Overlays two natal charts on top of each other. It reveals how each person’s planets interact with the other’s houses and aspects, showing the dynamic between the two individuals.
• Composite - Merges two natal charts into a single chart by averaging every planetary position. It treats the relationship as a third entity with its own personality, showing what the relationship itself is like.

Where synastry shows the push-and-pull between two people, the composite chart describes the relationship as a whole. Using both methods together gives you a more complete picture.

Reading the chart

You can read a composite chart exactly the way you would read a regular natal chart. Signs, houses, and aspects all carry their usual meanings - the only difference is that they describe the relationship rather than a single person.

• Composite Sun - Represents the central theme and purpose of the relationship.
• Composite Moon - Reflects the emotional tone and shared needs when the two people are together.
• Composite aspects - Reveal the internal energy dynamics, strengths, and challenges the relationship carries.

House placements show which areas of life the relationship expresses itself through most strongly. For instance, a composite Sun in the 7th house points to a partnership where the relationship itself takes center stage.

A reading example

Imagine a couple with a composite Sun in the 7th house of Libra. The reading: this is a relationship where partnership itself is the central theme (7th house), with a leaning toward beauty and fair balance (Libra). It describes the quality that emerges when these two people are together, not the tendencies of either individual.