# Hexagram Lookup

`GET https://api.astroway.info/v1/iching/lookup/{number}`

Fetch hexagram 1-64 by King Wen number.

Group: I Ching (Standalone). Auth: `X-Api-Key` header. Operation ID: `iching_lookup_{number}_get`.

## Parameters

| Name | In | Required | Type | Description |
|---|---|---|---|---|
| `number` | path | yes | integer | Hexagram number in King Wen order. |
| `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 | Successful calculation |
| 400 | Validation error |
| 401 | Missing or invalid API key |

### Success fields, under `data`

| Field | Type | Required | Description |
|---|---|---|---|
| `hexagram` | object | no |  |
| `hexagram.number` | number | no |  |
| `hexagram.name` | string | no |  |
| `hexagram.chinese` | string | no |  |
| `hexagram.trigrams` | number[] | no |  |
| `hexagram.lines` | object[] | no |  |
| `upperTrigram` | object | no |  |
| `upperTrigram.name` | string | no |  |
| `upperTrigram.symbol` | string | no |  |
| `upperTrigram.lines` | number[] | no |  |
| `lowerTrigram` | object | no |  |
| `lowerTrigram.name` | string | no |  |
| `lowerTrigram.symbol` | string | no |  |
| `lowerTrigram.lines` | number[] | no |  |
| `source` | string | no |  |

## Example

```bash
curl -X GET https://api.astroway.info/v1/iching/lookup/{number} \
  -H "X-Api-Key: aw_live_..." \
  -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/iching_lookup_number_get/