Compute Composite Chart
compute_composite_chartRead-onlyIdempotent
Calculate a midpoint composite chart for two individuals to reveal the astrological signature of their relationship. Uses shorter-arc midpoints from each person's natal chart.
Instructions
Compute a midpoint composite chart for two people: a single chart describing the relationship itself, built from the shorter-arc midpoints of the two natal charts' positions and angles.
Both birth locations are required (the composite angles derive from each chart's Ascendant/Midheaven).
Example:
{ datetime_a: "1990-03-15T15:45", timezone_a: "Europe/Riga", latitude_a: 56.95, longitude_a: 24.11, datetime_b: "1992-07-22T08:30", timezone_b: "America/New_York", latitude_b: 40.71, longitude_b: -74.01 }
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| datetime_a | Yes | Person A's birth date and time. | |
| timezone_a | No | IANA timezone the datetime is local to, e.g. "Europe/Riga" or "America/New_York". Omit when the datetime already carries Z or a UTC offset. | |
| latitude_a | Yes | Person A's birth latitude. | |
| longitude_a | Yes | Person A's birth longitude. | |
| datetime_b | Yes | Person B's birth date and time. | |
| timezone_b | No | IANA timezone the datetime is local to, e.g. "Europe/Riga" or "America/New_York". Omit when the datetime already carries Z or a UTC offset. | |
| latitude_b | Yes | Person B's birth latitude. | |
| longitude_b | Yes | Person B's birth longitude. | |
| house_system | No | House system: whole-sign (default), equal, porphyry, or placidus. | whole-sign |
| zodiac | No | Zodiac frame: tropical (Western default), sidereal-lahiri (Vedic), or sidereal-fagan-bradley (Western sidereal). | tropical |
Output Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| zodiac | Yes | ||
| positions | Yes | ||
| houses | Yes | ||
| aspects | Yes | ||
| note | Yes |