Astrology is mainly concerned with the nature of stars and planets, their movements, rotation periods, eclipses and other connected events and the consequential good or bad effects.  These calculations are important for human life on earth.  It is also a precise technique of personality assessment.  It tells us about the potentialities inherent in a person and his future possibilities.  One can also know what obstacles he is likely to face in the future and at what points in time.