adoration vs red letter day

adoration

noun
  • An act of religious worship. 

  • The selection of a pope by acclamation and before any formal ballot (excluded as a voting method in 1621 by Pope Gregory XV). 

  • Worship of Christ in the Eucharistic host in the Catholic Church, often while exposed in a monstrance. 

  • The act of adoring; loving devotion or fascination. 

  • Admiration or esteem. 

red letter day

noun
  • A particularly significant day; a day of personal or sectarian celebration. 

  • A day marked in red on calendars; a church feast day. 

How often have the words adoration and red letter day occurred in a corpus of books? (source: Google Ngram Viewer )