OF NICOLAUS CO-

PERNICUS OF THORN

ON THE REVOLUTIONS OF THE

heavenly spheres, Six Books.

You have in this newly born and published work, studious reader, the motions of the stars—both the fixed stars and the wandering stars original: "erraticarum"; referring to the planets—restored from both ancient and recent observations. Moreover, these motions are enhanced by new and marvelous hypotheses The term "hypothesis" here refers to the revolutionary mathematical model placing the Sun at the center of the system.. You also have most convenient tables, from which you can calculate these motions for any given time with the greatest of ease. Therefore: buy, read, and enjoy.

A circular collector's or library stamp is visible on the left side of the page. The stamp features a central shield with a fleur-de-lis positioned above a large letter S. The shield is flanked by the letters D (left), G (top), and A (right) within a circular border. These stamps track the book's journey through various private and public collections over the centuries.

PUBLIC LIBRARY OF THE CITY OF BOSTON Library marks including a perforated text and a faint circular ink stamp of the Boston Public Library are visible in the lower half of the page, indicating that this specific copy eventually became part of the library's collection.

Let no one untrained in geometry enter here.

original Greek: "Ἀγεωμέτρητος οὐδεὶς εἰσίτω." This is a famous motto said to have been inscribed at the entrance to Plato’s Academy in Athens, emphasizing that mathematics is the essential foundation for philosophy and science.

Nuremberg, at the house of Johannes Petreius,

In the Year 1543.

Ps.? 17:3 Likely a reference to Psalm 17:3, which mentions being visited "in the night," a fitting sentiment for an astronomer. From the library of M. Michael.