The Collaborative International Dictionary of English v.0.48:

Cosmographer \Cos*mog"ra*pher\ (-r?-f?r), n.
   One who describes the world or universe, including the
   heavens and the earth.
   [1913 Webster]

         The name of this island is nowhere found among the old
         and ancient cosmographers.               --Robynson
                                                  (More's
                                                  Utopia).
   [1913 Webster] Cosmographic

WordNet (r) 3.0 (2006):

cosmographer
    n 1: a scientist knowledgeable about cosmography [syn:
         cosmographer, cosmographist]