asterism vs horoscope

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). 

horoscope

noun
  • The position of the planets and stars at the moment of someone's birth; a diagram of such positions. 

  • An astrological forecast of a person's future based on such information. 

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