rride the default sense of positive longitude
   for a particular body, you can do so by defining the kernel
   variable

      BODY&lt;body ID&gt;_PGR_POSITIVE_LON

   where &lt;body ID&gt; represents the NAIF ID code of the body. This
   variable may be assigned either of the values

      'WEST'
      'EAST'

   For example, you can have this routine treat the longitude
   of the earth as increasing to the west using the kernel
   variable assignment

      BODY399_PGR_POSITIVE_LON = 'WEST'

   Normally 