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E. S. Kennedy and David Pingree have assembled and analyzed all that is presently available of a major work by an eighth-century Jewish astrologer known in medieval Europe as Messahala. A significant contribution to the knowledge of early Islamic astrology and, indirectly, of the earlier Persian period, the volume provides information concerning the Sasanian astronomy and aids in the understanding of the origin and transmission of astrological doctrine. The authors present a facsimile of the Arabic manuscript, its English translation, and commentary.