Study of the movements and relative positions of celestial bodies in order to divine information about human affairs (9)
I believe the answer is:
astrology
(Other definitions for astrology that I've seen before include "Belief in the influence of stars" , "It claims divination by the positions of the planets" , "Interpretation of celestial bodies as having an influence on human affairs" , "Fortune-telling from the stars" , "Study of the supposed influence of stars and planets on our affairs" .)