# Planet of the Day (public, no key)

`GET https://api.astroway.info/v1/public/planet-of-day`

Traditional (Chaldean) planetary ruler of the weekday: Sun=Sunday, Moon=Monday, …, Saturn=Saturday. Deterministic, no AI. `_footer` watermark. `localized` carries `planet` and `weekday` in the requested language; `themes` is an open set and stays English.

Group: Public. Auth: none, this endpoint answers without a key.

## Parameters

| Name | In | Required | Type | Description |
|---|---|---|---|---|
| `date` | query | no | string | Calendar date `YYYY-MM-DD` (UTC). Defaults to today. |
| `lang` | query | no | string | Language for this call, overriding `Accept-Language`. The canonical per-call form: a page that renders in one language passes it here rather than reconfiguring its client. Unknown or inactive codes fall back to `uk`. |
| `Accept-Language` | header | no | string | BCP-47 language (e.g. `uk`, `en`, `de`). Set it once on your HTTP client as its default; for a single call, `?lang=` overrides it. Unknown or inactive codes fall back to `uk`. |
| `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. |

## Responses

| Status | Meaning |
|---|---|
| 200 | OK |
| 400 | Invalid sign or date |

### Success fields, under `data`

| Field | Type | Required | Description |
|---|---|---|---|
| `date` | string | no |  |
| `weekday` | string | no |  |
| `planet` | string | no |  |
| `glyph` | string | no |  |
| `themes` | string[] | no |  |
| `localized` | object | no |  |
| `localized.planet` | string | no |  |
| `localized.weekday` | string | no |  |

## Example

```bash
curl 'https://api.astroway.info/v1/public/planet-of-day'
```

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Rendered from https://api.astroway.info/v1/openapi.json. HTML page: https://api.astroway.info/docs/api/operations/publicplanet-of-day/