Beyond marking the seasons, the chief interests that actuated the Babylonian astronomer in his observations were astrological. After quoting Diodorus to the effect that the Babylonian priests observed the position of certain stars in order to cast horoscopes, Thompson tells us that from a very early day the very name Chaldean became synonymous with magician. He adds that "from Mesopotamia, by way of Greece and Rome, a certain amount of Babylonian astrology made its way among the nations of the west, and it is quite probable that many superstitions which we commonly record as the peculiar product of western civilization took their origin from those of the early dwellers on the alluvial lands of Mesopotamia. One Assurbanipal, king of Assyria B.C. 668-626, added to the royal library at Nineveh his contribution of tablets, which included many series of documents which related exclusively to the astrology of the ancient Babylonians, who in turn had borrowed it with modifications from the Sumerian invaders of the country. Among these must be mentioned the series which was commonly called 'the Day of Bel,' and which was decreed by the learned to have been written in the time of the great Sargon I., king of Agade, 3800 B.C. With such ancient works as these to guide them, the profession of deducing omens from daily events reached such a pitch of importance in the last Assyrian Empire that a system of making periodical reports came into being. By these the king was informed of all the occurrences in the heavens and on earth, and the results of astrological studies in respect to after events. The heads of the astrological profession were men of high rank and position, and their office was hereditary. The variety of information contained in these reports is best gathered from the fact that they were sent from cities as far removed from each other as Assur in the north and Erech in the south, and it can only be assumed that they were despatched by runners, or men mounted on swift horses. As reports also came from Dilbat, Kutba, Nippur, and Bursippa, all cities of ancient foundation, the king was probably well acquainted with the general course of events in his empire."(12)