planetary vs skyly

planetary

adj
  • Of, or relating to the Earth; terrestrial. 

  • Of, or relating to planets, or the orbital motion of planets. 

  • epicyclic 

  • Of, or relating to the whole Earth; global. 

noun
  • A planetary nebula. 

skyly

adj
  • Of, resembling, or relating to the sky; celestial 

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