cylindrical vs spheric

cylindrical

adj
  • Shaped like a cylinder. 

  • Describing a map projection in which meridians are mapped onto vertical lines and parallels of latitude onto horizontal lines. 

spheric

adj
  • Spherical. 

  • Of or relating to the heavenly orbs, or to the sphere or spheres in which, according to ancient astronomy and astrology, they were set. 

How often have the words cylindrical and spheric occurred in a corpus of books? (source: Google Ngram Viewer )