A position on the planet Earth is specified by latitude and longitude (in degrees). The distance between two points on a sphere can be calculated with the following formula, where latitude and longitude are in radians and r is the radius of the sphere:

distance = r * arccos(sin(latitude1) * sin(latitude2) + cos(latitude1) * cos(latitude2) * cos(longitude1 - longitude2))

The radius of the planet Earth is 6371 km

Your task is to compute the distance between two `Location` objects.

Complete the following file:

### Location.java

Use the following file:

LocationTester.java

```public class LocationTester
{
public static void main(String[] args)
{
// Compute distance from Atlanta, Georgia to San Francisco, California
Location atlanta = new Location(33.755, -84.39);
Location sanFrancisco = new Location(37.7793, -122.4192);
System.out.printf("%8.1f kilometers\n", atlanta.getDistance(sanFrancisco));
System.out.println("Expected: 3436.5 kilometers");
// Should be the same distance either way
System.out.printf("%8.1f kilometers\n", sanFrancisco.getDistance(atlanta));
System.out.println("Expected: 3436.5 kilometers");
}
}
```