Input</a></h4>
<PRE>
 
   targ        is the name of a target body.  Optionally, you may 
               supply the integer ID code for the object as 
               an integer string.  For example both &quot;MOON&quot; and 
               &quot;301&quot; are legitimate strings that indicate the  
               moon is the target body. 
 
               The target and observer define a position vector 
               which points from the observer to the target. 
 
   et          is the ephemeris time, exp