> ## Documentation Index
> Fetch the complete documentation index at: https://docs.firebolt.io/llms.txt
> Use this file to discover all available pages before exploring further.

> Reference material for ST_X function

# ST_X

Extracts the longitude coordinate of a `GEOGRAPHY` Point. Returns `NULL` for empty geography objects. Returns an error if the input is not a single Point (and not an empty `GEOGRAPHY` object).

## Syntax

```sql theme={"theme":{"light":"github-light","dark":"github-dark"}}
ST_X(<object>)
```

## Parameters

| Parameter  | Description                                        | Supported input types |
| :--------- | :------------------------------------------------- | :-------------------- |
| `<object>` | The `GEOGRAPHY` Point to extract the longitude of. | `GEOGRAPHY`           |

## Return Type

`ST_X` returns a value of type `DOUBLE PRECISION`.

## Example

The following code example constructs a Point in the `GEOGRAPHY` data type from longitude and latitude coordinates and extracts its longitude coordinate:

```sql theme={"theme":{"light":"github-light","dark":"github-dark"}}
SELECT ST_X(ST_GEOGPOINT(-73.98551041593687, 40.75793403395676)) AS result
```

**Returns**

| result (DOUBLE PRECISION) |
| :------------------------ |
| -73.98551041593687        |