De revolutionibus orbium coelestium

De revolutionibus orbium coelestium ("On the revolutions of the heavenly spheres") is great work of the Renaissance astronomer Nicolaus Copernicus (1473–1543).
The book, first printed in 1543 in Nuremberg, Holy Roman Empire of the German Nation, offered proof that the Earth went round the Sun, and not vice versa, as had been thought. 
This was an alternative model of the universe to Ptolemy's Earth-centered system, which had been accepted since ancient times.
Copernicus had worked his ideas out many years before, however he did not publish until right before his death because he himself did not truly believe it and only proposed the idea as a philosophy experiment. 
Contents.
In its standard English edition, the book contains 330 folio pages, 100 pages of tables, and over 20,000 tabulated numbers.
The book is dedicated to Pope Paul III in a preface that argues that mathematics, not physics, should be the basis for understanding and accepting his new theory. 
"De revolutionibus" is divided into six "books" (sections or parts): 
This book is often referred to as the start of modern science.