Function polarDistanceDegrees( ra1, dec1, radius1, ra2, dec2, radius2 )

Description:
Calculates the distance in three dimensional space between two points specified in spherical polar coordinates.
Parameters:
ra1 (floating point)
right ascension of point 1 in degrees
dec1 (floating point)
declination of point1 in degrees
radius1 (floating point)
distance from origin of point1
ra2 (floating point)
right ascension of point 2 in degrees
dec2 (floating point)
declination of point2 in degrees
radius2 (floating point)
distance from origin of point2
Return Value (floating point):
the linear distance between point1 and point2; units are as for radius1 and radius2
Signature:
double polarDistanceDegrees(double, double, double, double, double, double)