      these bodies. 
 
              The default interpretation of longitude by this 
              and the other planetographic coordinate conversion 
              routines can be overridden; see the discussion in 
              Particulars below for 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 angl