 describing flattening coefficient of the body,
               a dimensionless value defined as:

                    equatorial_radius - polar_radius
                    --------------------------------
                           equatorial_radius

               [1,1] = size(f); double = class(f)

   the call:

      [ lon, lat, alt ] = <b>cspice_recpgr</b>( body, rectan, re, f)

   returns:

       lon   the value(s) describing the planetographic longitude of the
             input point.  

            