Liber Astronomiae

Liber Astronomiae is Guido Bonatti's own thirteenth century primary text, a working astrologer's summation of the Arabic transmitted astrological tradition he practiced and taught in northern Italy, not independent scholarship testing whether the methods he sets out actually predict anything. As a primary text it is authoritative for what this specific medieval Latin astrological tradition itself prescribed, checkable against the translation, not for a modern historical account of how Latin astrology developed or was received, which needs a dedicated scholarly history addressing that question. The composition date given is approximate, consistent with Bonatti's active career, and this record states that rather than a false precise year. Use it for the content of this text's own astrological doctrine; it is not evidence that the methods it teaches work, a claim this primary source does not itself attempt to establish.