Source : Webster's Revised Unabridged Dictionary (1913)

Horoscopy \Ho*ros"co*py\, n.
   1. The art or practice of casting horoscopes, or observing
      the disposition of the stars, with a view to prediction
      events.

   2. Aspect of the stars at the time of a person's birth.

Source : WordNet®

horoscopy
     n : the drawing up and interpretation of horoscopes