asterism vs heavens

asterism

noun
  • An unofficial constellation (small group of stars that forms a visible pattern). 

  • A rarely used typographical symbol (⁂, three asterisks arranged in a triangle), used to call attention to a passage or to separate subchapters in a book. 

  • A star-shaped figure exhibited by some crystals by reflected light (as in a star sapphire) or by transmitted light (as in some mica). 

heavens

noun
  • The distant sky of the sun, moon, and stars. 

intj
  • An expression of surprise, contempt, outrage, disgust, boredom, or frustration. 

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