Astrology is a method of predicting mundane events based upon the assumption that the celestial bodies—particularly the planets and the stars considered in their arbitrary combinations or configurations (called constellations)—in some way either determine or indicate changes in the sublunar world
Answer:
I had walked for two hours before I felt tired.
Explanation:
The "had" is used to show that two events took place but one started and finished before the other took place.