-' 
 
              evaluated at the input values of `lon', `lat' and `alt'. 
 </PRE>
<h4><a name="Parameters">Parameters</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Exceptions">Exceptions</a></h4>
<PRE>
 
   1) If the body name `body' cannot be mapped to a NAIF ID code, 
      and if `body' is not a string representation of an integer, 
      the error SPICE(IDCODENOTFOUND) will be signaled. 
 
   2) If the kernel variable   
 
         BODY&lt;ID code&gt;_PGR_POSITIVE_LON 
 
      is present in the ke