In ancient times astronomers were also astrologers. With the advent of science a gradual separation took place and presently astronomers distance themselves from something as unscientific as astrology is thought to be. This is understandable because astronomy deals with the physical aspects of the universe and astrology deals with spiritual aspects.
There are many books about astrology that prove that astrology works. After all, the distances between an earthling and the cosmic bodies, which are the determining factors of a horoscope, are immense. It makes sense that the sun and the moon influence life on earth, should affect life on earth. And yet it can have profound effects on someone's life because this planet moves so slowly that its influence through a specific aspect.