or details.

             Longitude is measured in radians. On input, the range
             of longitude is unrestricted.

      lat    planetographic latitude of the input point.  For a point P on the
             reference spheroid, this is the angle  between the XY plane and
             the outward normal vector at P. For a point P not on the
             reference spheroid, the planetographic latitude is that of the
             closest point to P on the spheroid.

             [1,n] = size(lat); doub