From the book
Epinomis
Plato · Diotimos Editions · 2026
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At a Glance
- The wordAstronomia is the study of the stars, astronomos its practitioner, and astronomein the corresponding activity.
- In EpinomisThe delayed announcement of astronomy answers the opening question about what a mortal must learn to be wise.
- In this edition“Astronomy,” “astronomer,” and “does astronomy” preserve the repeated family.
- A place to readδι’ ἀπειρίαν τοῦ πράγματος — Inexperience of the matter accounts for the unexpected name.
Meaning
Astronomia is the study of the stars, astronomos its practitioner, and astronomein the corresponding activity. These related expressions do not guarantee that every person to whom the name is applied possesses the same kind or degree of understanding. Dysmē and anatolē are setting and rising. They name useful observable events without themselves specifying the full science the Athenian demands.
Use in the book
The delayed announcement of astronomy answers the opening question about what a mortal must learn to be wise. Its name comes as a surprise because the uninitiated hearer lacks experience of the actual subject (990a). The surprise also depends on the dialogue's earlier dismissal of other activities as insufficient for wisdom. The positive answer must show why this subject is more than another useful specialized skill.
The Athenian accordingly distinguishes the true astronomer from one who does astronomy “after Hesiod's fashion.” He gives risings and settings as examples of the latter's objects. The supplied note points to the agricultural timing of the Works and Days: the Pleiades, Arcturus, and Orion mark activities of the farmer's year. Those references explain the polemical example. The dialogue does not claim that a farmer's observations are false or that Hesiod never speaks of anything except these events. It excludes their practical use, taken by itself, from the highest wisdom under discussion.
The positive description concerns the seven circuits within the full set of eight. These are the moon's, the sun's, and the five planetary circuits; the contrary eighth belongs to the full celestial ordering described earlier. Each of the seven goes through its own cycle, and contemplating this adequately requires an exceptional nature (990a–b). The distinction is therefore at once about the object's extent, the learner's capacities, and the kind of understanding attained.
The following curriculum supplies the omitted content: pure number, geometry, stereometry, proportions and musical relations, then the divine visible order, examined through questioning and brought into a unified understanding. Astronomy names this culminating field within an educational and theological project. Calling it “modern astronomy” without qualification would conceal the soul-based causation, divine honors, and ethical requirements built into the claim. Calling it mere religious symbolism would equally conceal its demand for differentiated motions, mathematical relations, and precision.
The boast that the true astronomer “must” be wisest is the Athenian's conclusion. It is not a concession that every competent observer or calculator is already good. The end requires both the natural virtues and the studies, taken up in the right way.
Places to read
- 990aδι’ ἀπειρίαν τοῦ πράγματος — Inexperience of the matter accounts for the unexpected name
- 990aἀστρονομίαν — The name finally given to the sought subject
- 990aτὸν ἀληθῶς ἀστρονόμον — The qualification “truly” distinguishes the required practitioner
- 990aτὸν καθ’ Ἡσίοδον ἀστρονομοῦντα — The expressly excluded Hesiodic model
- 990aδυσμάς τε καὶ ἀνατολὰς — Settings and risings exemplify that model's observations
- 990a–bτῶν ὀκτὼ περιόδων τὰς ἑπτὰ περιόδους — The seven circuits are studied within an eightfold ordering
Translation in this edition
“Astronomy,” “astronomer,” and “does astronomy” preserve the repeated family. “Circuit” renders periodos and “cycle” kyklos. The note identifies the seven; it does not turn the text into a tabulation of modern orbital periods. The title “wisest” remains attached to the true astronomer and to the complete course's properly formed recipient.
Properly qualified practitioner — ἀστρονόμος (astronomos)
ἀστρονόμος (astronomos)
Properly qualified practitioner. Only the true astronomer is called necessarily wisest, with the adjective true excluding mere practical expertise. Attested: ἀστρονόμον (990a). Astronomy Hesiod and the surprising name of wisdom.
Culminating study of divine order — ἀστρονομία (astronomia)
ἀστρονομία (astronomia)
Culminating study of divine order. The unexpectedly named wisdom includes the seven circuits and their mathematical preparation; it is not identical to every practical study of star appearances. Attested: ἀστρονομίαν (990a). Astronomy Hesiod and the surprising name of wisdom.
Hesiodic practice contrasted — ἀστρονομεῖν (astronomein)
ἀστρονομεῖν (astronomein)
Hesiodic practice contrasted. The participle describes observing in Hesiod's manner, exemplified by risings and settings and distinguished from the required full study. Attested: ἀστρονομοῦντα (990a). Astronomy Hesiod and the surprising name of wisdom.
Practical calendrical exemplar — Ἡσίοδος (Hēsiodos)
Ἡσίοδος (Hēsiodos)
Practical calendrical exemplar. The poet stands for a mode of astronomy concerned with risings and settings; his name does not amount to a refutation of every part of his poetry. Attested: Ἡσίοδον (990a). Astronomy Hesiod and the surprising name of wisdom.
Reason for the surprising subject-name — ἀπειρία (apeiria)
ἀπειρία (apeiria)
Reason for the surprising subject-name. The hearer's unfamiliarity with the matter makes astronomy an unexpected answer to the search for wisdom. Attested: ἀπειρίαν (990a). Astronomy Hesiod and the surprising name of wisdom.
Practical celestial event — ἀνατολή (anatolē)
ἀνατολή (anatolē)
Practical celestial event. Risings paired with settings identify the contrast class to the true astronomer's seven-circuit study. Attested: ἀνατολὰς (990a). Astronomy Hesiod and the surprising name of wisdom.
Practical celestial event — δυσμή (dysmē)
δυσμή (dysmē)
Practical celestial event. Settings are paired with risings as the observations exemplifying Hesiodic astronomy, useful but insufficient for the highest wisdom. Attested: δυσμάς (990a). Astronomy Hesiod and the surprising name of wisdom.
Right divine apprehension — σύννοια (synnoia)
σύννοια (synnoia)
Right divine apprehension. Even a small share of right and divine understanding makes the direction of true wisdom apparent. Attested: συννοίας (987c). Astronomy Hesiod and the surprising name of wisdom.
An unexpected name through inexperience (contextual phrase)
ὅ τις οὐκ ἄν ποτε δόξειεν δι’ ἀπειρίαν τοῦ πράγματος (990a)
Astronomy is surprising because the hearer lacks experience of what the subject really comprises. The surprise is not the same as the Athenian admitting that the proposed wisdom is arbitrary or unsupported. Astronomy Hesiod and the surprising name of wisdom.