code: function inverse$16(p) {
  
          var x = p.x;
          var y = p.y;
  
          p.x = adjust_lon(this.long0 + ((x - this.x0) / (this.a * this.rc)));
          p.y = adjust_lat(this.lat0 + ((y - this.y0) / (this.a)));
          return p;
      }
docs: inverse equations--mapping x,y to lat/long -----------------------------------------------------------------