 angle

 
   All of the above angles can be computed using light time 
   corrections, light time and stellar aberration corrections, or 
   no aberration corrections.  The way aberration corrections 
   are used is described below. 
 
   Care must be used in computing light time corrections.  The 
   guiding principle used here is &quot;describe what appears in 
   an image.&quot;  
 
 
      Observer-target body surface point vector 
      -----------------------------------------
 
      Let `et' be the 