# Synastry (HTML)

`GET https://api.astroway.info/v1/embed/synastry`

Two-subject compatibility score + key cross-aspects.

Group: Embeddable Widgets. Auth: none, this endpoint answers without a key. Operation ID: `embed_synastry_get`.

## Parameters

| Name | In | Required | Type | Description |
|---|---|---|---|---|
| `date_a` | query | no | string | Birth date `YYYY-MM-DD` of subject A. Required; the widget renders an error without both subjects. |
| `time_a` | query | no | string | Birth time of subject A. Defaults to 12:00:00. |
| `tz_a` | query | no | number | UTC offset of subject A. Defaults to 0. |
| `lat_a` | query | no | number | Latitude of subject A. Defaults to 0. |
| `lng_a` | query | no | number | Longitude of subject A. Defaults to 0. |
| `date_b` | query | no | string | Birth date `YYYY-MM-DD` of subject B. Required; the widget renders an error without both subjects. |
| `time_b` | query | no | string | Birth time of subject B. Defaults to 12:00:00. |
| `tz_b` | query | no | number | UTC offset of subject B. Defaults to 0. |
| `lat_b` | query | no | number | Latitude of subject B. Defaults to 0. |
| `lng_b` | query | no | number | Longitude of subject B. Defaults to 0. |
| `lang` | query | no | "uk" \| "en" \| "de" \| "ru" \| "pl" \| "es" \| "pt" \| "fr" \| … | Widget language. Also accepts the Accept-Language header. |
| `theme` | query | no | "dark" \| "light" \| "console" | Colour scheme. Unknown values fall back to dark. |
| `undefined` |  | no | object |  |
| `undefined` |  | no | object |  |

## Responses

| Status | Meaning |
|---|---|
| 200 | Rendered widget markup, ready to drop into an iframe. |
| 400 | Validation error |
| 401 | Missing or invalid API key |

## Example

```bash
curl -X GET https://api.astroway.info/v1/embed/synastry \
  -H "Content-Type: application/json"
```

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