The Collaborative International Dictionary of English v.0.48:

Heliographic \He`li*o*graph"ic\
   (h[=e]`l[i^]*[-o]*gr[a^]f"[i^]k), a. (Astron.)
   1. Of or pertaining to a description of the sun.
      [Webster 1913 Suppl.]

   Note: Heliographic longitudes and latitudes of spots on the
         sun's surface are analogous to geographic longitudes
         and latitudes of places on the earth.
         [Webster 1913 Suppl.]

   2. Of or pertaining to heliography or a heliograph; made by
      heliography.
      [1913 Webster]

   Heliographic chart. See under Chart.
      [1913 Webster]