Composite chart calculator
Composite chart is the midpoint of two natal charts. For each planet, ASC and MC, the composite point is the shortest-arc midpoint between the two corresponding bodies. All computation runs in your browser.
What this calculator does
Each composite point is the midpoint on the ecliptic between the corresponding bodies in Chart A and Chart B. The composite Sun sits halfway between A's Sun and B's Sun, the composite Moon between A's and B's Moons, and so on.
Composite Ascendant and MC are the midpoints of the two ASCs and two MCs respectively. Houses are assigned by Whole-Sign from the composite ASC.
See also synastry (geometric aspects between the two original charts) and birth chart.
Reference, not advice
This is cultural and astronomical reference, not personal prediction or advice.
Composite midpoints are a mathematical construction. They are not a relationship recommendation, compatibility score, or prediction.
Last reviewed .