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In Babylon as well as in Assyria as a direct offshoot of Babylonian culture, astrology takes its place as one of the two chief means at the disposal of the priests (who were called bare or "inspectors") for ascertaining the will and intention of the gods, the other being through the inspection of the livers of sacrificial animals (see omen).


Early originsEdit

Babylonian astrology was the first organized system of astrology, arising in the second millennium BC.[1] There is speculation that astrology of some form appeared in the Sumerian period in the 3rd millennium BC, but the isolated references to ancient celestial omens dated to this period are not considered sufficient evidence to demonstrate an integrated theory of astrology.[2] The history of scholarly celestial divination is therefore generally reported to begin with late Old Babylonian texts (c. 1800 BC), continuing through the Middle Babylonian and Middle Assyrian periods (c. 1200 BC).[3]

By the 16th century BC, the extensive employment of omen-based astrology can be evidenced in the compilation of a comprehensive reference work known as Enuma Anu Enlil. Its contents consisted of 70 cuneiform tablets comprising 7,000 celestial omens. Texts from this time also refer to an oral tradition – the origin and content of which can only be speculated upon.[4] At this time Babylonian astrology was solely mundane, and prior to the 7th century BC the practitioners' understanding of astronomy was fairly rudimentary. Because of their inability to accurately predict future celestial phenomena and planetary movement very far in advance, interpretations were done as the phenomena occurred or slightly before.[citation needed] By the 4th century, however, their mathematical methods had progressed enough to calculate future planetary positions with reasonable accuracy, at which point extensive ephemerides began to appear.[5]

Divinatory basisEdit

The history of Babylonian astrology shows the development of astronomical knowledge within the context of divination. A collection of 32 tablets with inscribed liver models, dating from about 1875 BC, are the oldest known detailed texts of Babylonian divination, and these demonstrate the same interpretational format as that employed in celestial omen analysis.[6] Blemishes and marks found on the liver of the sacrificial animal were interpreted as symbolic signs which presented messages from the gods to the king.

The gods were also believed to present themselves in the celestial images of the planets or stars with whom they were associated. Evil celestial omens attached to any particular planet were therefore seen as indications of dissatisfaction or disturbance of the god that planet represented.[7] Such indications were met with attempts to appease the god and find manageable ways by which the god’s expression could be realised without significant harm to the king and his nation. An astronomical report to the king Esarhaddon concerning a lunar eclipse of January 673 BC shows how the ritualistic use of substitute kings, or substitute events, combined an unquestioning belief in magic and omens with a purely mechanical view that the astrological event must have some kind of correlate within the natural world:

… In the beginning of the year a flood will come and break the dikes. When the Moon has made the eclipse, the king, my lord, should write to me. As a substitute for the king, I will cut through a dike, here in Babylonia, in the middle of the night. No one will know about it.[8]

Ulla Koch-Westenholz, in her 1995 book Mesopotamian Astrology, argues that this ambivalence between a theistic and mechanic worldview defines the Babylonian concept of celestial divination as one which, despite its heavy reliance on magic, remains free of implications of targeted punishment with the purpose of revenge, and so “shares some of the defining traits of modern science: it is objective and value-free, it operates according to known rules, and its data are considered universally valid and can be looked up in written tabulations".[9] Koch-Westenholz also establishes the most important distinction between ancient Babylonian astrology and other divinatory disciplines as being that the former was originally exclusively mundane, being geographically oriented and specifically applied to countries cities and nations, and almost wholly concerned with the welfare of the state and the king as the governing head of the nation.[10]

Planets and godsEdit

Of the planets five were recognized—Jupiter, Venus, Saturn, Mercury and Mars—to name them in the order in which they appear in the older cuneiform literature; in later texts Mercury and Saturn change places.

These five planets were identified with the gods of the Babylonian pantheon as follows:

The movements of the Sun, Moon and five planets were regarded as representing the activity of the five gods in question, together with the moon-god Sin and the Sun-god Shamash, in preparing the occurrences on earth. If, therefore, one could correctly read and interpret the activity of these powers, one knew what the gods were aiming to bring about.

System of InterpretationEdit

Detail of the Ishtar Gate in Babylon

The Babylonian priests accordingly applied themselves to the task of perfecting a system of interpretation of the phenomena to be observed in the heavens, and it was natural that the system was extended from the moon, sun and five planets to the more prominent and recognizable fixed stars.

The interpretations themselves were based (as in the case of divination through the liver) chiefly on two factors:

  • On the recollection or on written records of what in the past had taken place when the phenomenon or phenomena in question had been observed, and
  • Association of ideas—involving sometimes merely a play upon words—in connection with the phenomenon or phenomena observed.

Thus, if on a certain occasion, the rise of the new moon in a cloudy sky was followed by victory over an enemy or by abundant rain, the sign in question was thus proved to be a favourable one and its recurrence would thenceforth be regarded as a good omen, though the prognostication would not necessarily be limited to the one or the other of those occurrences, but might be extended to apply to other circumstances.

On the other hand, the appearance of the new moon earlier than was expected was regarded as unfavourable - prognosticating in one case defeat, in another death among cattle, in a third bad crops - not necessarily because these events actually took place after such a phenomenon, but by an application of the general principle resting upon association of ideas whereby anything premature would suggest an unfavourable occurrence.

In this way a mass of traditional interpretation of all kinds of observed phenomena was gathered, and once gathered became a guide to the priests for all times. However, not all of these ideas are still used in astrology as it is usually practiced today.

Limits of early knowledgeEdit

Astrology in its earliest stage was marked by three characteristic limitations:

General natureEdit

The first limitation was that the movements and position of the heavenly bodies point to such occurrences as are of public import and affect the general welfare. The individual's interests are not in any way involved, and we must descend many centuries and pass beyond the confines of Babylonia and Assyria before we reach that phase which in medieval and modern astrology is almost exclusively dwelt upon—the individual horoscope.

In Babylonia and Assyria the cult centred largely and indeed almost exclusively in the public welfare and the person of the king, because upon his well-being and favour with the gods the fortunes of the country were dependent, in accordance with the ancient conception of kingship.[11]

Astronomical expertiseEdit

The second limitation was that the astronomical knowledge presupposed and accompanying early Babylonian astrology was, though essentially of an empirical character, limited and flawed. The theory of the ecliptic as representing the course of the Sun through the year, divided among twelve constellations with a measurement of 30° to each division, is of Babylonian origin, as has now been definitely proved; but it does not appear to have been perfected until after the fall of the Babylonian empire in 539 BC.

Similarly, the other accomplishments of Babylonian astronomers, such as their system or rather systems of moon calculations and the drawing up of planetary tablets, belong to this late period, so that the golden age of Babylonian astronomy belongs not to the remote past, as was until recently supposed, but to the Seleucid period; i.e. after the advent of the Greeks in the Euphrates Valley.

From certain expressions used in astrological texts that are earlier than the 7th century BC it would appear, indeed, that the beginnings at least of the calculation of sun and moon eclipses belong to the earlier period, but here, too, the chief work accomplished was after 400 BC, and the defectiveness of early Babylonian astronomy may be gathered from the fact that as late as the 6th century BC an error of almost an entire month was made by the Babylonian astronomers in the attempt to determine through calculation the beginning of a certain year.

In a general way, the reign of law and order in the movements of the heavenly bodies was recognized, and indeed must have exercised an influence at an early period in leading to the rise of a methodical divination that was certainly of a much higher order than the examination of an animal's liver.

However, the importance that was laid upon the endless variations in the form of the phenomena and the equally numerous apparent deviations from what were regarded as normal conditions, prevented for a long time the rise of any serious study of astronomy beyond what was needed for the purely practical purposes that the priests as "inspectors" of the heavens (as they were also the "inspectors" of the sacrificial livers) had in mind.


The third limitation was that there is little evidence that the signs of the zodiac that we now recognise, were used in Babylonian astronomy prior to 700 BC. However, probably from as early as the days of Hammurabi c. 2000 BC, Babylonian astrologers did develop the idea of constellations by depicting prominent groups of stars with outlines of images derived from their mythology and religion.


Ashurbanipal was a king of Assyria who ruled in the seventh century BC from 668 to 625 BC.[12] He was famous for assembling a great library of cuneiform tablets in Nineveh on the subjects of astrology, history, mythology, and science. Some of Assurbanipal's astrologers, such as Rammanu-sumausar and Nabu-musisi, became so adept at deducing omens from daily movements of the planets that a system of making periodical reports to the king came into being. Thus, Assurbanipal received swift messengers detailing "all occurrences in heaven and earth" throughout his kingdom and the results of his astrologer's examinations of them. He then used this information as a political weapon, and for the practical day-to-day running of his kingdom. After his death Nineveh fell to the Medes and the Chaldean Babylonians, and Assurbanipal's library was destroyed or dispersed.

See alsoEdit


  1. ^ Holden (1996) p.1.
  2. ^ Rochberg (1998) p.ix. See also, Neugebauer (1969) pp.29-30.
  3. ^ Rochberg (1998) p.x.
  4. ^ Baigent (1994) p.71.
  5. ^ Holden (1996) p.9.
  6. ^ Koch-Westenholz (1995) p.16.
  7. ^ Koch-Westenholz (1995) p.11.
  8. ^ Koch-Westenholz (1995) p.12. Tablet source given as: State Archives of Assyria 8 250.
  9. ^ Koch-Westenholz (1995) p.13.
  10. ^ Koch-Westenholz (1995) p.19.
  11. ^ J. G. Frazer, The Early History of Kingship
  12. ^ Derek and Julia Parker, Ibid, p198, 1990


  • Baigent, Michael, 1994. From the Omens of Babylon: Astrology and Ancient Mesopotamia. Arkana. ISBN 0-14-019480-0.
  • Holden, James Herschel, 1996. A History of Horoscopic Astrology. AFA. ISBN 978-0-86690-463-6.
  • Koch-Westenholz, Ulla, 1995. Mesopotamian astrology. Volume 19 of CNI publications. Museum Tusculanum Press. ISBN 978-87-7289-287-0.
  • Neugebauer, Otto, 1969 (1st edition: 1957). The Exact Sciences in Antiquity (2nd ed.) Dover Publications. ISBN 978-0-486-22332-2.
  • Rochberg, Francesa, 1998. Babylonian Horoscopes. American Philosophical Society. ISBN 0-87169-881-1.
  • Verderame, Lorenzo, "The Primeval Zodiac: Its Social, Religious, and Mythological Background", in J.A. Rubiño-Martín et al., Cosmology Across Cultures, ASP Conference Series 409, San Francisco, 2009, 151-156.