Composite Chart Calculator
Enter two birth charts to calculate the relationship chart made from planetary midpoints, then compare it with synastry.
Frequently Asked Questions
What is a composite chart?
A composite chart is a relationship chart created from the midpoints between two people's natal planets. It describes the relationship as its own symbolic entity.
How is a composite chart calculated?
Each composite planet is the shortest-arc midpoint between the same natal planet in person A and person B. The calculator then reads aspects among those composite planets.
Composite chart vs synastry: what is the difference?
Synastry compares two separate charts and shows how two people affect each other. Composite charts blend the two charts and describe the relationship field they create together.
Do both people need exact birth times?
Exact times improve the full chart context and angles. Planetary midpoint signs are still useful without exact times, but Moon and angle-sensitive interpretation can shift.
How accurate is this composite chart calculator?
It calculates both natal charts with Swiss Ephemeris precision, then derives composite midpoint positions in TypeScript from those exact longitudes.
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