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      $a = 6378206.4;
      $b = 6356583.8;

// Reduced or Parametric Latitude
   Latitude Ellipsoid::
...
   double y = b * sin(eta*deg2rad);
   return sqrt(x*x + y*y);
}  // Radius

// Given a Lat,Lon point, a distance (in meters), and an azimuth (in d
+egrees),
// this routine returns a new Lat,Lon point.
...

   return LatLon(lat, lon);
}  // NewLatLon