circumnavigation vs perambulation

circumnavigation

noun
  • The act of circumnavigating, or sailing round. 

perambulation

noun
  • A survey, a tour; a walking around. 

  • The district thus inspected. 

  • An English legal ceremony in which an official from a town or parish walks around it to delineate and record its boundaries. 

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