Skip to main content
University of California Press

About the Book

Galileo's 1632 book, Dialogue on the Two Chief World Systems, Ptolemaic and Copernican, comes alive for twentieth-century readers thanks to Maurice Finocchiaro's brilliant new translation and presentation. Condemned by the Inquisition for its heretical proposition that the earth revolves around the sun, Galileo's masterpiece takes the form of a debate, divided into four "days," among three highly articulate gentlemen.

Finocchiaro sets the stage with his introduction, which not only provides the human and historical framework for the Dialogue but also admits the reader gracefully into the basic non-Copernican understanding of the universe that would have been shared by Galileo's original audience. The translation of the Dialogue is abridged in order to highlight its essential content, and Finocchiaro gives titles to the various parts of the debate as a guide to the principal topics. By explicating his own critical reading of this text that is itself an exercise in critical reasoning on a gripping real-life controversy, he illuminates those universal, perennial activities of the human mind that make Galileo's book a living document. This is a concrete, hands-on introduction to critical thinking. The translation has been made from the Italian text provided in volume 7 of the Critical National Edition of Galileo's complete works edited by Antonio Favaro. The translator has also consulted the 1632 edition, as well as the other previous English translations, including California's 1967 version.

Galileo on the World Systems is a remarkably nuanced interpretation of a classic work and will give readers the tools to understand and evaluate for themselves one of the most influential scientific books in Western civilization.

About the Author

Maurice A. Finocchiaro is Distinguished Professor of Philosophy at the University of Nevada, Las Vegas.

Table of Contents

Editorial Preface and Acknowledgments

Introduction
1. Significance of Galileo's Dialogue
2. The Geostatic Worldview
3· The Copernican Controversy
4. The Galileo Affair
5· Historical Aftermath and Philosophical Prelude

SElECTIONS FROM GALILEO'S DIALOGUE
Outline of Selections

To the Discerning Reader
1. Preface

First Day
2. Natural Motion and Aristotle's Logic
3. Heavenly Changes and Aristotle's Empiricism
4. Life on the Moon, and Human versus Divine Understanding

Second Day
5· Independent-Mindedness and the Role of Aristotle's Authority
6. Diurnal Rotation, Simplicity, and Probability
7. The Case against Terrestrial Rotation and the Value of Critical Reasoning
8. Vertical Fall, Superposition of Motions, and the Role of Experiments
9. Extruding Power and the Role of Mathematics
10. The Deception of the Senses and the Relativity of Motion

Third Day
11. Heliocentrism and the Role of the Telescope
12. The Role of the Bible
13. Stellar Dimensions and the Concept of Size
14. Stellar Parallax and the Fruitfulness of a Research Program

Fourth Day
15. The Cause of the Tides and the Inescapability of Error
16. Ending

Appendix
1. Critical Reasoning
2. Methodological Reflection
3. Varieties of Rhetoric
Glossary
Bibliography

Reviews

"This is a very creative piece of work which merits the highest praise. It should be of great value for students and for the general reader."—I. Bernard Cohen, author of Guide to Newton's "Principia"

"Finocchiaro has done a superb job of presenting Galileo to the modern reader. The Dialogue is a work of extreme difficulty, requiring a compendious introduction, careful selection, translation and analysis of texts, and thoughtful evaluation of its impact on Western culture. With his well-known logical ability and a feel for pedagogy rare among scholars, Finocchiaro meets these demands in an exceptional way. His is a classic introduction to Galileo's masterpiece."—William A. Wallace, author of Galileo's Logic of Discovery and Proof

"I recommend Galileo on the World Systems for any course on Galileo. The introduction does a fine job of situating the book in the intellectual climate of the time, and the notes make Galileo's prose and arguments thoroughly accessible."—Albert Van Helden, translator of Galileo's Sidereus Nuncius