St. Albert the Great, doctor of the Church, did studies on the relationship of the star placements with the earth's ordering. I read elsewhere that he thought there was usefulness in studying such personal influences, not for prediction sake or passivity or fate, but for helping individuals to overcome tendencies within personalities that could enhance or hinder their ongoing search for God. Albertus wrote a complete treatise on astrology and astronomy, considered at the time to be a single unified system, in his Speculum Astronomiae, "The Mirror of Astronomy". Albertus says of astrology, which explains the effects of the stars and planets on earthly affairs, that it provides a connection between natural philosophy, which treats of the material world and metaphysics, which treats of the Divine World. That the inferiors of the material world are so obedient to the unchanging cycles of the Celestial World, says Albertus, is a great proof of the primacy of God. "No human science attains this ordering of the universe as perfectly as the science of the judgement of the stars does." Speculum Astronomiae Chapter 3. Albertus is careful to explain the differences between licit and illict use of the knowledge of astrology, particularly in the problematic area of astrological talismans. In this extract from the Speculum AstronomiaeAlbertus discusses various astrological talismans and which are evil and demonic and which are the product of natural magic and the natural powers of the Heavens. Albertus also provides a voluminous discussion of the talismans of various Zodiacal and extra Zodiacal constellations from his treatise De Mineralibus, "On Minerals". Both of these extracts are a fascinating look at the state of the art thinking in medieval scholasticism, a radical departure from earlier medieval thought. Albertus' acceptance of the licit nature of some astrological talismans was quite influential on later Renaissance mages like Cornelius Agrippa and Marsilio Ficino. ...... Albert made this a central component of his philosophical system, arguing that an understanding of the celestial influences affecting us could help us to live our lives more in accord with Christian precepts. The most comprehensive statement of his astrological beliefs is to be found in a work he authored around 1260, now known as the Speculum astronomiae.