centre of attention vs cynosure

centre of attention

noun
  • Something that attracts a lot of attention. 

cynosure

noun
  • Something that is the center of attention; an object that serves as a focal point of attraction and admiration. 

  • Ursa Minor or Polaris, the North Star, used as a guide by navigators. 

  • That which serves to guide or direct; a guiding star. 

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