*heliographic*

a. (Astron.) 1. Of or pertaining to a description of the sun. [ Webster 1913 Suppl. ]

☞ 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 ]