First, we need to understand what it is, and it's possible origins. Astrology users also believe that this method can be used to predict future events. The practice of Astrology is firmly rooted in pagan worship of the stars and occultism. Some believe that astrology was first developed by the ancient Chaldeans. It evolved over the ages with one of the major spiritual influences on it being Theosophy.
Theosophy is a system of belief which origininated in Hinduism.
Blavatsky co-founded the Theosophical Society in 1875 with Henry Olcott. Theosophy relied primarily on the channeling of spirits and alleged contact with spirit guides. Astrology was further impacted by well known astrologer Isabel Hickey. Hickey devised a number of ideas for interpreting astrological charts. Astrologers then, and now believe that one can choose to harness and use the force of the planet to reap growth and benefits from previously uncontrollable events.