descending vs obliquity

descending

noun
  • A descent. 

adj
  • Ordered such that each element is less than or equal to the previous element. 

  • Moving or sloping downwards. 

  • Becoming lower in pitch. 

  • Causing a sequence to follow a descending order. 

obliquity

noun
  • Axial tilt. 

  • Mental or moral deviation or perversity; immorality. 

  • The quality of being obscure, oftentimes willfully, sometimes as an exercise in euphemism. 

  • The quality of being oblique in direction, deviating from the horizontal or vertical; or the angle created by such a deviation. 

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