Ancient omens were not simply random guesses: in Mesopotamia, they formed organized systems for interpreting signs and turning uncertainty into possible action. Their history offers a useful comparison with algorithmic decision-making—not because omens were algorithms, but because both raise questions about evidence, interpretation, authority and bias.
What people used when the future was uncertain
Long before computational models, people sought guidance in signs they believed could disclose what lay ahead. Written omen traditions are documented in Mesopotamia by the early second millennium BCE, and divination also appears in the ancient Near East, Egypt, Greece, Italy and China, according to Oxford Bibliographies.
These practices were varied, not a single universal method. Mesopotamian diviners interpreted celestial events, dreams, births, animals, atmospheric phenomena and the organs of sacrificed animals. The Cambridge History of Science describes distinct scholarly roles, including the celestial scholar, liver diviner, exorcist, physician and lamentation priest. Divination was part of a wider body of specialist knowledge, not merely a private hunch.
A tablet made from signs
One concrete example is the Old Babylonian lunar-eclipse omen corpus. In a 2024 article, Andrew George and Junko Taniguchi present four tablets they describe as the oldest known compendia of lunar-eclipse omens. The entries organize signs by such features as the time of night, the shadow’s movement, the eclipse’s duration and the date. The record shows a systematic way of sorting observations into interpretive categories; it does not establish that the predictions were statistically tested in the modern sense.
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Celestial signs were only one part of the archive. Lorenzo Verderame reports several hundred cuneiform tablets documenting celestial divination from the late third millennium BCE through the end of the first millennium BCE. A fragment in the Metropolitan Museum of Art records prognostications based on the condition of a sacrificed sheep’s liver. The museum describes this kind of practice as a means of communication between divine and human worlds.
How an omen turned uncertainty into a decision
Divination could offer a procedure when a person or ruler faced choices whose consequences were not yet knowable. An interpretation might warn, reassure or suggest a response. The sign did not make the future certain; it made uncertainty actionable by joining an observation to an explanation and, potentially, a course of action.
Francesca Rochberg’s analysis cautions against reducing Babylonian omen texts to a simple opposition between science and superstition. Their statements often take a conditional form: if a particular sign occurs, a possible consequence follows. The Cambridge History of Science describes the structure as inferential reasoning expressed through conditionals, while also presenting omen lists as products of scholarly systematization and theorizing. These are historically specific forms of reasoning; calling them “data analysis” without qualification would imply methods and standards the evidence does not establish.
For a personal-finance reader, the relevant parallel is the decision problem, not the supernatural premise. A person choosing whether to borrow, save or make a major purchase also acts without knowing every future outcome. Ancient divination shows how people have used rules and interpreters to make such uncertainty feel manageable. It does not show that omens can forecast financial outcomes, or that a modern model is equivalent to a diviner.
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What omens and algorithms have in common—and what they do not
The comparison is most useful when kept structural. In both cases, an input is interpreted according to rules by someone with expertise or institutional standing, and the result may influence a decision. Their inputs, methods and claims about knowledge differ substantially.
| Question | Omen systems in the evidence | Modern algorithmic judgment |
|---|---|---|
| What goes in? | Signs such as celestial events, dreams or observed animal organs. | Data supplied to a model or system; the particular inputs vary by application. |
| How is it interpreted? | Through inherited categories and conditional associations recorded in scholarly compendia. | Through the system’s model or rules; no single method is common to all algorithms. |
| Who interprets or applies it? | Specialists such as celestial scholars and liver diviners, sometimes within court or temple settings. | Analysts, institutions or platforms may build, deploy or act on a model. |
| What can it produce? | A warning, reassurance, ritual response or recommendation. | A score, classification, forecast or recommendation, depending on the application. |
| Where does authority sit? | With specialists and institutions that preserve and interpret the omen tradition. | With the people and institutions that develop, select and use the system. |
| What can go wrong? | Human error, corruption, motivated interpretation and using an omen to legitimize political power. | Opaque expertise, selective evidence and motivated interpretation are relevant points of comparison; this historical evidence does not establish the technical failure modes of any particular modern model. |
The analogy ends at that level. An ancient conditional omen is not a computational algorithm in the modern sense. Nor does a record of systematic classification demonstrate reliable prediction. What the comparison can illuminate is a recurring human problem: a method may organize uncertainty and still leave room for error, self-interest and unequal authority.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Romans and Chinese thinkers did not simply agree about divination
Ancient societies did not hold one uniform position on whether signs truly revealed the future. Cicero’s De Divinatione is an explicit debate about whether divination is valid. A 2025 comparative study, “Beyond Doubt,” considers Cicero alongside the Chinese thinkers Dong Zhongshu and Xunzi. The traditions differ, but the comparison identifies a tension between speculative claims about signs and practical political or ritual needs.
This matters because a practice can remain useful to a community or institution even while people question its truth claims. Divination might serve ritual or political purposes without every participant accepting every prediction. The surviving debate is evidence of disagreement within these traditions, not proof that all Romans or Chinese thinkers were skeptics—or believers.
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What this history can teach about bias and prediction
Omen traditions concentrated interpretive power in people trained to read signs. That expertise could help make a difficult situation legible, but it could also make the interpreter hard to challenge. Oxford scholarship on Near Eastern augury highlights insecurity, the possibility of human error and corruption, and the use of omens for political legitimation. Reassurance and authority could therefore come from the same system.
For anyone using a forecast or recommendation in a consequential decision, the history suggests practical questions rather than a verdict against prediction:
- What is the input? Identify which observations or records shape the conclusion, and what might be missing.
- What rule connects input to outcome? Ask whether the connection is stated as a possibility or presented as certainty.
- Who is interpreting the result? Consider what expertise or institutional interests stand behind the recommendation.
- What action does it authorize? A warning or forecast can influence a choice without proving that the choice is necessary.
- How could the conclusion be challenged? Look for a way to examine assumptions and account for error, rather than treating authority as evidence by itself.
The surviving omen records do not supply a statistical measure of predictive accuracy that would settle these questions. Their value here is historical: they show that organized prediction can help people act amid uncertainty, while the people and institutions interpreting it shape what the signs are allowed to mean.
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