Composite Chart Calculator

How a composite is calculated

A composite is built from the midpoints between the matching planets of two charts. If your Venus sits at 10 degrees of Aries and your partner's at 20 degrees of Gemini, the composite Venus lands at 15 degrees of Taurus, exactly halfway. Every planet and angle is derived the same way.

Because of that the composite belongs to neither person. It portrays the relationship itself: what it lives on, where it is heading, what comes naturally to it and what takes effort from both.

What to read first in a composite

The composite Sun shows the main theme of the pair, the Moon its emotional climate, the Ascendant how the couple appears from outside. The house the composite Sun falls into often names the area the relationship is organised around.

A Sun in the seventh house gives a couple focused on each other, in the tenth a shared enterprise or a public alliance, in the fourth home and family. Aspects to the composite Sun show what supports that theme and what obstructs it.

• •Sun: the main theme of the relationship
• •Moon: the everyday and emotional climate
• •Venus and Mars: tenderness and passion inside the pair
• •Saturn: what holds the couple together and what constrains it

Limits of the method

A composite has no real birth moment, so it has no movement of its own in time: transits to it work less reliably than transits to an ordinary chart. For forecasting on a couple the Davison chart, which has a genuine date and place, serves better.

The other limit is that a composite does not show who does what. It describes the outcome of the interaction, not the roles. Who pushes and who retreats is a synastry question, not a composite one.

Composites beyond romance

The method works for any lasting pair: business partners, co-authors, a parent and a child. The theme simply reads from a different angle: for a business pair the composite Mercury outweighs Venus, and Saturn shows whether the collaboration survives deadline pressure.

For groups larger than two a composite is no longer built, since the midpoint stops meaning anything. There you work with the individual pairs inside the group.