One of the problems with astrology is the general lack of a sound mechanism by which celestial objects might exert an "influence" over our lives. This is particularly important because, if astrologers want their field to be considered scientific, some testable mechanism must be proposed. It simply cannot be enough to postulate mystical or supernatural connections between us and various planets - this is the province of religion and faith, not science and reason. Read Article: Is There a Mechanism for Astrology?