Apian, a noted German mathematician, astronomer and geographer, compiled several geographical publications during the first half of the 16th century. His work displayed various iterations of the American continent as originally depicted in Martin Waldseemüller's 1507 world map.
A small and generalized version was the circular world map which was included in his astronomical and geographical text book, ''Cosmographicus Liber'', first published in 1524. Using a stereographic projection centered on the North Pole, this circular map shows only the outlines of the known continents -- Europe, Asia, Africa and America. The shape of the latter appears to be patterned after Waldseemüller's America.
Since Apian's popular text book was reissued in numerous editions over the next eighty years, this generalized diagram of the continents certainly had a wide influence in spreading a new world view that encompassed four continents
Title supplied by cataloger.