ascent vs perihelion

ascent

noun
  • An eminence, hill, or high place. 

  • The act of ascending; a motion upwards. 

  • An increase, for example in popularity or hierarchy 

  • The ascender height in a typeface. 

  • The degree of elevation of an object, or the angle it makes with a horizontal line; inclination; gradient; steepness 

  • The way or means by which one ascends. 

perihelion

noun
  • The highest point or state; the peak, zenith. 

  • The point in the elliptical orbit of a comet, planet, etc., where it is nearest to the Sun. 

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