# `Longitude`

Degrees east of the prime meridian, from -180 to 180: `-0.1276`.

Use it where you hold a longitude apart from its latitude. When you have both, use [`Point`](/docs/types/type-point.md).

## Shape

One `Decimal` from -180 to 180.

## Example

```jadpo
Longitude(-0.1276)
```

A value outside its limits breaks `min` or `max`.

`text.parse(raw, as: Longitude)` reads one from text that comes from outside. Text that isn't one at all fails `malformed`, such as `0.1276 W`, `W0.1276` or `-0,1276`.

## Good to know

- West is negative. `text.format` shows the letter: `0.1276° W`.
- In JSON it is a string, so no decimal places are lost on the way.
- `==` tells you whether two are the same, and `<` and `list.sort_by` compare and sort them.

## In JSON

A string, in a request, a response or `json.write`:

```json
"-180"
"-0.1276"
"0"
```

## Details

<details>
<summary>Text form, storage, how it is shown, and operations</summary>

`Longitude` is in the group Geospatial, and has been in Jadpo since 0.1.0.

### Text form

`text.from` writes one standard text form, the same form `text.parse` reads back: `-180`, `-0.1276` and `0`.

### How it is stored

It is stored in one column named for the field, of type `numeric`. `0` is stored as `0`.

### How it is shown to people

`text.format(value, locale:)` shows it to people in their locale.

With `locale: Locale.en_gb`:

| Value | Shown |
|---|---|
| `-180` | `180° W` |
| `-0.1276` | `0.1276° W` |
| `0` | `0°` |
| `151.2093` | `151.2093° E` |
| `180` | `180° E` |

### Operations

It also takes `text.parse`, `text.from`, `text.format`, `json.read`, `json.write` and `==`. [How every standard type behaves](/docs/every-standard-type-meets-one-contract.md) says how they work.

</details>