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Book I Chapter 23 · I.23.2.1–I.23.3.1
Ancient Greek
p. 5542 ⟨Ἀετίου καὶ Διδύμου⟩ · 1
Ἀριστοτέλης ἐκ πέμπτου σώματος.
Λέγει γοῦν ἐν τοῖς Περὶ τῆς φυσικῆς ἀκροάσεως καὶ οὐρανοῦ λόγοις οὕτως.
2 ⟨Ἀετίου καὶ Διδύμου⟩ · 2
Συνεστάναι δὲ τὰ ἄστρα καὶ τὸν οὐρανὸν ἐκ τοῦ αἰθέρος· τοῦτον δὲ οὔτε βαρὺν οὔτε κοῦφον οὔτε γενητὸν οὔτε φθαρτὸν οὔτε αὐξόμενον οὔτε μειούμενον ἐς ἀεὶ διαμένειν ἄτρεπτον καὶ ἀναλλοίωτον, πεπερασμένον καὶ σφαιροειδῆ καὶ ἔμψυχον, κινούμενον περὶ τὸ μέσον ἐγκυκλίως.
3 ⟨Ἀετίου⟩ · 1
Θαλῆς, Πυθαγόρας καὶ οἱ ἀπ᾽ αὐτοῦ μεμερίσθαι τὴν τοῦ παντὸς οὐρανοῦ σφαῖραν εἰς κύκλους πέντε, οὕστινας προσαγορεύουσι ζώνας· καλεῖται δ᾽ αὐτῶν ὁ μὲν ἀρκτικός τε καὶ ἀειφανής, ὁ δὲ θερινὸς τροπικός, ὁ δὲ ἰσημερινός, ὁ δὲ χειμερινὸς τροπικός, ὁ δὲ ἀνταρκτικός τε καὶ ἀφανής.
Stobaeus, Volume I: Book I Chapter 23
p. 5552 ⟨Aëtius and Didymus⟩: A fifth body
Aristotle held that heaven is made from a fifth body.699
For he speaks as follows in his works Physics and On Heaven:700
2 ⟨Aëtius and Didymus⟩: The enduring aether
The stars and heaven are constituted from aether. This is neither heavy nor light, neither generated nor perishable, neither increasing nor diminishing; it remains forever unchanging and unaltered, bounded, spherical, and endowed with soul, moving in a circle around the center.701
3 ⟨Aëtius⟩: Five celestial circles
Thales, Pythagoras, and his followers held that the sphere of the whole heaven is divided into five circles, which they call zones. Of these, one is called arctic and always visible; another, the summer tropic; another, the equator; another, the winter tropic; and another, antarctic and invisible.702
Socrates
Reading Stobaeus, Volume I · Book I Chapter 23 · I.23.2.1–I.23.3.1
Ask about a concept, passage, contradiction, or connection.
Socrates will begin with this book and its sources.About This Reading Edition
Stobaeus gathered Greek philosophy and poetry for his son Septimius. Volume I presents the dedication testimony, On Arithmetic, Book I through chapter 60, and the ancient contents of all four books. This complete bilingual edition includes an introduction and 2,117 explanatory notes.
Historical Text and Translation
The Greek follows Curt Wachsmuth’s 1884 Volume I, checked against the supplied scan. Gaps, lost-chapter headings, and uncertain attributions remain visible. Chapter 2 includes a labeled proposed reconstruction. The appendix outlines Books I–IV; the full texts of Books II–IV are outside this volume. Reader pages preserve the companion PDF’s numbering.
About Diotimos Editions
Diotimos Editions prepared this independent English translation directly from the Greek. Prose and verse retain their distinct forms, with mixed passages preserving their quoted verse. Every passage is paired with its Greek and identified by the edition’s reference number. All 2,117 notes remain linked to their passages, with continuous numbering across the introduction and text.
Rights
Stobaeus’s ancient Greek work and Wachsmuth’s 1884 printing are in the public domain. The independent English translation, introduction, and explanatory notes are © 2026 Diotimos Editions. The complete supplied edition is available as PDF, EPUB, Word, and Markdown. The PDF retains the fixed page locations used by the companion lexicon.