# Group Synastry

`POST https://api.astroway.info/v1/group-synastry`

Calculate synastry aspects among 2–8 charts simultaneously, returning all pairwise cross-chart aspect matrices.

Group: Comparisons. Auth: `X-Api-Key` header. Operation ID: `group-synastry`.

## Parameters

| Name | In | Required | Type | Description |
|---|---|---|---|---|
| `fields` | query | no | string | Comma-separated dotted paths, relative to `data`, to keep in the response. A path is applied to every element of an array, so `planets.name` means the name of each planet. Paths that match nothing come back in `_fields_unmatched`; a list where nothing matches at all is a 400, because an empty object would be a confident wrong answer. |
| `precision` | query | no | integer | Round every non-integer number in the response to this many decimal places. Integers are left alone, because an id is not a measurement. Ecliptic longitudes ship with fourteen decimals by default; 2 is about a tenth of an arcminute. |

## Request body

| Field | Type | Required | Description |
|---|---|---|---|
| `inputs` | ChartInput[] | yes |  |

```json
{
  "inputs": [
    {
      "date": "1990-05-15",
      "time": "15:30:00",
      "timezone": "Europe/Kyiv",
      "latitude": 50.45,
      "longitude": 30.52,
      "name": "Person A"
    },
    {
      "date": "1985-11-03",
      "time": "09:15:00",
      "timezone": "Europe/Kyiv",
      "latitude": 48.46,
      "longitude": 35.04,
      "name": "Person B"
    }
  ]
}
```

## Responses

| Status | Meaning |
|---|---|
| 200 | Successful calculation |
| 400 | Validation error |
| 401 | Missing or invalid API key |

### Success fields, under `data`

| Field | Type | Required | Description |
|---|---|---|---|
| `charts` | object[] | no |  |
| `pairs` | object[] | no |  |
| `matrix` | number[][] | no |  |
| `averageScore` | number | no |  |

## Example

```bash
curl -X POST https://api.astroway.info/v1/group-synastry \
  -H "X-Api-Key: aw_live_..." \
  -H "Content-Type: application/json" \
  -d '{ "inputs": [ { "date": "1990-05-15", "time": "15:30:00", "timezone": "Europe/Kyiv", "latitude": 50.45, "longitude": 30.52, "name": "Person A" }, { "date": "1985-11-03", "time": "09:15:00", "timezone": "Europe/Kyiv", "latitude": 48.46, "longitude": 35.04, "name": "Person B" } ] }'
```

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Rendered from https://api.astroway.info/v1/openapi.json. HTML page: https://api.astroway.info/docs/api/operations/group-synastry/