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The belief in and study of the influence upon human character of cosmic forces emanating from celestial bodies. There are two fundamentally different methods, or approaches, to astrology: geocentric astrology is based upon calculations of the planetary positions as seen by the observer on the Earth, i.e., using the Earth as a center; heliocentric astrology bases its interpretations upon the positions within the solar system with reference to the Sun as the center. As to purpose and application, there are several distinct branches of astrology, such as agricultural, electional, horary, mundane, natal astrology, astrometeorology, etc.
-- Dictionary of Mysticism