ce that corresponds to the desired output
              at `etto'.


   etfrom     is the epoch in ephemeris seconds past the epoch
              of J2000 (TDB) corresponding to the `from' reference
              frame.


   etto       is the epoch in ephemeris seconds past the epoch
              of J2000 (TDB) that corresponds to the `to' reference
              frame.
</PRE>
<h4><a name="Detailed_Output">Detailed_Output</a></h4>
<PRE>
   rotate     is the transformation matrix that relates the reference
