# Biorhythm (SVG)

`POST https://api.astroway.info/v1/render/biorhythm`

Three-curve sine plot of physical (23d), emotional (28d), and intellectual (33d) cycles since birth.

Group: Visualization. Auth: `X-Api-Key` header. Operation ID: `render_biorhythm`.

## 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 |
|---|---|---|---|
| `birthDate` | string | yes |  |
| `rangeStart` | string | yes |  |
| `rangeEnd` | string | yes |  |
| `options` | object | no |  |
| `options.size` | integer | no |  |
| `options.theme` | "light" \| "dark" \| "console" | no |  |
| `options.showAspects` | boolean | no |  |
| `options.showRetrograde` | boolean | no |  |
| `options.title` | string | no |  |
| `options.format` | "svg" \| "json" | no |  |
| `options.width` | integer | no |  |
| `options.height` | integer | no |  |

```json
{
  "birthDate": "1990-05-15",
  "rangeStart": "2026-01-01",
  "rangeEnd": "2026-12-31",
  "options": {
    "width": 1000,
    "height": 400
  }
}
```

## Responses

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

### Success fields, under `data`

| Field | Type | Required | Description |
|---|---|---|---|
| `svg` | string | no |  |
| `format` | string | no |  |
| `byteLength` | number | no |  |

## Example

```bash
curl -X POST https://api.astroway.info/v1/render/biorhythm \
  -H "X-Api-Key: aw_live_..." \
  -H "Content-Type: application/json" \
  -d '{ "birthDate": "1990-05-15", "rangeStart": "2026-01-01", "rangeEnd": "2026-12-31", "options": { "width": 1000, "height": 400 } }'
```

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