asterism vs configuration

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). 

configuration

noun
  • The arrangement of electrons in an atom, molecule, or other physical structure like a crystal. 

  • Relative position or aspect of the planets; the face of the horoscope, according to the relative positions of the planets at any time. 

  • The way things are arranged or put together in order to achieve a result. 

  • Form, as depending on the relative disposition of the parts of a thing's shape; figure; form factor. 

  • A finite set of points and lines (and sometimes planes), generally with equal numbers of points per line and equal numbers of lines per point. 

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