# Documentation

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# rad2km

Convert spherical distance from radians to kilometers

## Syntax

```km = rad2km(rad) km = rad2km(rad,radius) km = rad2km(rad,sphere) ```

## Description

`km = rad2km(rad)` converts distances from radians to kilometers as measured along a great circle on a sphere with a radius of 6371 km, the mean radius of the Earth.

`km = rad2km(rad,radius)` converts distances from radians to kilometers as measured along a great circle on a sphere having the specified radius. `radius` must be in units of kilometers.

`km = rad2km(rad,sphere)` converts distances from radians to kilometers, as measured along a great circle on a sphere approximating an object in the Solar System. `sphere` may be one of the following: `'sun'`, `'moon'`, `'mercury'`, `'venus'`, `'earth'`, `'mars'`, `'jupiter'`, `'saturn'`, `'uranus'`, `'neptune'`, or `'pluto'`, and is case-insensitive.

## See Also

#### Introduced in R2007a

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