noon vs turning point

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 

turning point

noun
  • A decisive point at which a significant change or historical event occurs, or at which a decision must be made. 

  • A crossroads. 

  • A T-junction. 

  • A maximum or minimum on a graph. 

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