ascent vs declination

ascent

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

  • The act of ascending; a motion upwards. 

  • An increase, for example in popularity or hierarchy 

  • The ascender height in a typeface. 

  • The way or means by which one ascends. 

  • An eminence, hill, or high place. 

declination

noun
  • At a given point, the angle between the line connecting this point with the geographical center of the earth and the equatorial plane. 

  • At a given point, the angle between magnetic north and true north. 

  • A refusal. 

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