eclipse vs lighten

eclipse

verb
  • To overshadow; to be better or more noticeable than. 

  • Of astronomical or atmospheric bodies, to cause an eclipse. 

  • To undergo eclipsis. 

noun
  • An alignment of astronomical objects whereby one object comes between the observer (or notional observer) and another object, thus obscuring the latter. 

  • Especially, an alignment whereby a planetary object (for example, the Moon) comes between the Sun and another planetary object (for example, the Earth), resulting in a shadow being cast by the middle planetary object onto the other planetary object. 

  • A seasonal state of plumage in some birds, notably ducks, adopted temporarily after the breeding season and characterised by a dull and scruffy appearance. 

  • Obscurity, decline, downfall. 

lighten

verb
  • To make less serious or more cheerful. 

  • To become light or lighter in weight. 

  • To become brighter or clearer; to brighten. 

  • To illuminate with knowledge; to enlighten. 

  • To descend; to light. 

  • To emit or disclose in, or as if in, lightning; to flash out, like lightning. 

  • To alleviate; to reduce the burden of. 

  • To become less serious or more cheerful. 

  • To make brighter or clearer; to illuminate. 

  • To make light or lighter in weight. 

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