efine        OBSERVER      &quot;earth&quot;
          #define        TARGET        &quot;moon&quot;
         

          /.
          Local variables
          ./
          SpiceInt       i;

          SpiceDouble    et;
          SpiceDouble    lt;
          SpiceDouble    pos [3];


          /.
          Load the spk file.
          ./
          <a href="furnsh_c.html">furnsh_c</a> ( SPK );

          /.
          Step through a series of epochs, looking up a position vector
          at each one.
     