horoscopy vs occultism

horoscopy

noun
  • The aspect of the stars at the time of a person's birth. 

  • The casting of horoscopes. 

occultism

noun
  • The study of the supernatural 

  • A belief in occult powers and the hope of controlling them 

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