 and the
   Y-axis equal to the cross product of the unit Z-axis and X-axis
   vectors.

   The planetographic definition of latitude is identical to the
   planetodetic (also called &quot;geodetic&quot; in SPICE documentation)
   definition. In the planetographic coordinate system, latitude is
   defined using a reference spheroid.  The spheroid is
   characterized by an equatorial radius and a polar radius. For a
   point P on the spheroid, latitude is defined as the angle between
   the X-Y plane and the