# Documentation

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Convert spherical distance from radians to statute miles

## Syntax

```sm = rad2sm(rad) sm = rad2sm(rad,radius) sm = rad2sm(rad,sphere) ```

## Description

`sm = rad2sm(rad)` converts distances from radians to statute miles as measured along a great circle on a sphere with a radius of 6371 km, the mean radius of the Earth.

`sm = rad2sm(rad,radius)` converts distances from radians to statute miles as measured along a great circle on a sphere having the specified radius. `radius` must be in units of statute miles.

`sm = rad2sm(rad,sphere)` converts distances from radians to statute miles, 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.

## Examples

How long is a trip around the equator in statute miles?

```sm = rad2sm(2*pi) sm = 2.4874e+04```

How about on Jupiter?

```sm = rad2sm(2*pi,'jupiter') sm = 2.7283e+005```