free rein vs latitude

free rein

noun
  • The absence of constraints; freedom to make decisions. 

  • Loose rein(s), as of a horse. 

latitude

noun
  • The relative freedom from restrictions; scope to do something. 

  • The angular distance of a heavenly body from the ecliptic. 

  • Extent or scope; e.g. breadth, width or amplitude. 

  • The extent to which a light-sensitive material can be over- or underexposed and still achieve an acceptable result. 

  • An imaginary line (in fact a circumference) around a planet running parallel to the planet's equator. 

  • The angular distance north or south from a planet's equator, measured along the meridian of that particular point. 

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