# ST_Azimuth

## Name

ST_Azimuth — Returns the north-based azimuth of a line between two points.

## Synopsis

```
float
```

geometry
**
ST_Azimuth
**
(
`
origin
`
, geometry
`
target
`
```
)
```

;

```
float
```

geography
**
ST_Azimuth
**
(
`
origin
`
, geography
`
target
`
```
)
```

;

## Description

Returns the azimuth in radians of the target point from the origin point, or NULL if the two points are coincident. The azimuth angle is a positive clockwise angle referenced from the positive Y axis (geometry) or the North meridian (geography): North = 0; Northeast = π/4; East = π/2; Southeast = 3π/4; South = π; Southwest 5π/4; West = 3π/2; Northwest = 7π/4.

For the geography type, the azimuth solution is known as the inverse geodesic problem .

The azimuth is a mathematical concept defined as the angle between a reference vector and a point, with angular units in radians.
The result value in radians can be converted to degrees using the PostgreSQL function
```
degrees()
```

.

Azimuth can be used in conjunction with
ST_Translate
to shift an object along its perpendicular axis. See
the
```
upgis_lineshift()
```

function in the
PostGIS wiki
for an implementation of this.

Availability: 1.1.0

Enhanced: 2.0.0 support for geography was introduced.

Enhanced: 2.2.0 measurement on spheroid performed with GeographicLib for improved accuracy and robustness. Requires PROJ >= 4.9.0 to take advantage of the new feature.