noon vs zenith

noon

noun
  • The highest point; culmination. 

  • The letter ن in the Arabic script. 

  • The time of day when the sun is in its zenith; twelve o'clock in the day, midday. 

verb
  • To relax or sleep around midday 

zenith

noun
  • Highest point or state; peak. 

  • The point in the sky vertically above a given position or observer; the point in the celestial sphere opposite the nadir. 

  • The highest point in the sky reached by a celestial body. 

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