Before computational algorithms, people used omens, specialist interpreters and written rules to make uncertain choices actionable. In ancient Mesopotamia, divination was an organized system: a sign was interpreted through learned categories and could lead to a warning, reassurance or recommended response. That makes omens worth comparing with modern decision systems—not as early computers, but as a revealing history of how people turn ambiguous evidence into decisions and authority.
What did people use before algorithms to make decisions under uncertainty?
They used many ways of making sense of the unknown, including divination: interpreting events or objects as signs that might indicate what would happen or what action to take. The surviving written evidence shows that this was not one universal practice. It varied across the ancient Near East, Egypt, Greece, Italy and China. In Mesopotamia, written omen traditions are attested by the early second millennium BCE, while cuneiform records of celestial divination extend from the late third millennium BCE through the first millennium BCE.
Divination addressed a practical problem: a person or ruler had to choose among possible actions without knowing their outcomes. An omen did not make the future certain. Instead, it offered a procedure for interpreting a sign and deciding what to do next. The Oxford study Ancient Mesopotamian Divination: Anxiety and Methods of Decision-Making describes divination as a way to handle uncertainty, warning or reassuring an individual or a community about the future.
Signs came from many domains
Mesopotamian diviners attended to celestial events, dreams, births, animals, atmospheric conditions and the organs of sacrificed animals. The Metropolitan Museum of Art describes a clay tablet fragment recording prognostications based on the liver of a sacrificial sheep. In this practice, the observed organ was understood as a means of communication between divine and human worlds.
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Interpretation was specialized work
These practices involved distinct scholarly roles rather than a single all-purpose fortune-teller. The Cambridge History of Science identifies celestial scholars, liver diviners, exorcists, physicians and lamentation priests within the Mesopotamian repertoire. Written compendia preserved categories and associations that specialists could consult and interpret.
How did Babylonian diviners interpret signs?
They matched observations to learned interpretive categories, often expressed as conditional statements: if a particular sign appeared, a particular consequence might follow. The sign was not treated as a simple physical law that mechanically caused the predicted outcome. It was read as meaningful evidence within a system of inference.
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A lunar-eclipse corpus made observations comparable
A 2024 article by Andrew George and Junko Taniguchi presents four Old Babylonian tablets as the oldest known compendia of lunar-eclipse omens. The corpus arranges omens according to features such as the time of night, the movement of the shadow, the duration and the date. That organization let readers compare a particular observation with a structured body of recorded interpretations.
Francesca Rochberg’s analysis, described by the Cambridge History of Science, emphasizes the conditional syntax and inferential reasoning of Babylonian omen statements. Calling this a form of systematic knowledge helps avoid reducing the material to arbitrary superstition. It does not mean the predictions were tested or validated by modern statistical methods, or that their explanatory assumptions were the same as those of contemporary science.
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Were ancient omens a kind of early data analysis?
There is a useful structural comparison, but omens were not algorithms in the modern computational sense. Both omen systems and algorithmic systems can take observations, apply categories or rules, and produce guidance that an institution or person may use. The resemblance concerns how people organize evidence and act under uncertainty—not shared technology, mathematical foundations or demonstrated predictive accuracy.
| Question | Ancient omen systems | Modern algorithmic systems |
|---|---|---|
| What is interpreted? | Signs such as celestial events, dreams or sacrificed-animal organs. | Inputs selected for a particular system; the relevant inputs depend on its design. |
| How is meaning assigned? | Through inherited categories and conditional associations recorded in omen traditions. | Through computational rules or models; their design and operation vary. |
| Who interprets or acts? | Specialists, including diviners and celestial scholars, working within scholarly and institutional settings. | People and institutions that build, deploy, interpret or act on a system’s output. |
| What follows? | A warning, reassurance, ritual response or decision recommendation. | An output that may inform a decision; its use depends on the system and its operator. |
| Where can authority gather? | Among specialists and institutions such as courts, temples and scholarly archives. | Among organizations and people who control a system, its inputs or the decisions based on it. |
| What can go wrong? | Interpretive error, motivated readings, selective attention to signs and political legitimation. | Errors or bias in the system or its use, opaque expertise, selective evidence and motivated interpretation. |
The comparison is most useful as a question about judgment: who chose what counted as evidence, who had the standing to interpret it, and whose interests were served by the resulting recommendation? It becomes misleading if it implies that ancient diviners used computation, that modern algorithms carry supernatural authority, or that the two systems are equivalent.
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Did Romans and Chinese thinkers believe in divination?
The evidence does not support a simple answer in which whole societies either believed or disbelieved. A 2025 comparative study, “Beyond Doubt,” reads Cicero’s De Divinatione alongside the Chinese thinkers Dong Zhongshu and Xunzi. It finds tensions between speculative claims about signs and the practical political or ritual reasons divination could be maintained.
Cicero made disagreement part of the discussion
De Divinatione debates whether divination is valid; it is not evidence that every Roman accepted omen-reading without question. Its importance here is that skepticism and argument existed within the tradition itself. The same broader caution applies to the Chinese comparison: the study identifies differing approaches and tensions, not a single shared doctrine or uniform public belief.
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What can occult history teach us about bias and prediction?
It shows that a prediction system is also a social arrangement. Someone selects the sign, someone applies the rules, and someone decides what the interpretation authorizes. In Mesopotamian contexts, omens could reassure or warn, but scholarship on Near Eastern augury also highlights the risks of error and corruption and the use of omens to legitimize political power. Expertise could help people navigate uncertainty while concentrating authority in the hands of interpreters and institutions.
- Ask what counts as evidence. A system’s output depends on which observations are recorded or accepted as relevant.
- Separate the rule from the interpreter. A written association does not eliminate judgment about how a sign fits it or what response to recommend.
- Notice who gains authority. A decision aid can become a source of institutional or political legitimacy, not merely a neutral forecast.
- Be wary of stories built from outcomes. Selectively remembering apparent successes while overlooking failures can make a prediction system seem more reliable than the evidence warrants.
- Keep uncertainty visible. A warning or recommendation is not the same thing as certainty about what will happen.
These are questions for modern algorithmic decisions as well as historical divination, but the comparison is a tool for examining judgment—not proof that the systems work alike. The ancient record shows that people have long built procedures to make uncertain choices feel interpretable. It also shows why such procedures deserve scrutiny: the meaning of an output depends not only on the sign or rule, but on the people and institutions that interpret it.
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