Annunciation vs Assumption

Annunciation

name
  • The announcement by the archangel Gabriel to Mary that she would give birth to a son, namely Jesus. Celebrated on 25th March. 

Assumption

name
  • A Catholic holy day of obligation (August 15) celebrating the Assumption of Mary. 

  • The Assumption of Mary, the mother of Jesus, into heaven, a Catholic dogma. 

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