circa vs somewhere

circa

prep

  • Approximately, about, around (typically in relation to time) 

somewhere

noun

  • Unspecified or unknown (unlocated) place or location. 

adv

  • In an uncertain or unspecified location. 

  • To an uncertain or unspecified location. 

  • At some unspecified point. 

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