This library is built in the open.
If you spot an error, have a suggestion, or just want to say hello — we’d love to hear from you.

Euclidis Opera Omnia, Vol. 7 (Optica et Catoptrica)
English translations of this work exist from another source language, but this specific text has never been translated.
The work 'Euclidis Opera Omnia, Vol. 7 (Optica et Catoptrica)', edited by J.L. Heiberg (1895), is a critical edition of the Greek text with a Latin translation on facing pages. While the original Greek text of Euclid's 'Optics' and 'Catoptrics' has been translated into English by various scholars (e.g., Burton, 1945; Smith, 1996), there is no evidence of a complete English translation of the specific Latin text provided by Heiberg in this volume. The Latin translation in this volume is a scholarly tool for the Greek original, and it has not been translated into English itself.
Verified Mar 30, 2026 via local catalogs, open library, google books, internet archive, openalex, loc · methodology
Euclid did not just define geometry; he calculated how we see the world. This volume provides the definitive critical edition of his optical theories, stripping away centuries of scribal errors to reveal the mathematical mechanics of light, mirrors, and human perception.