asterism vs moonlight

asterism

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

  • 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. 

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

moonlight

noun
  • The light reflected from the Moon. 

verb
  • To engage in an activity other than what one is known for. 

  • To work on the side (at a secondary job), often in the evening or during the night. 

  • To perform a secondary function substantially different from its supposed primary function, as in protein moonlighting. 

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