| |
| | Copernicus's Book |
 | | Title page of Copernicus, De Revolutionibus, the last two words in the title, 'celestium orbium' were added without the knowledge of the author or editor, Rheticus. |
 | | When it was finally published in March 1543, the De Revolutionibus contained an anonymous letter to the reader and two additional words to the title, celestium orbium ('of the celestial orbs'), which neither the author or Rheticus had intended. |
 | | The De Revolutionibus was placed on the Index of Prohibited Books in 1616 as a result of the Galileo affair, but because of its contribution to the Calendrical Reform, it was not proscribed, but was to be expurgated. |
| www.hps.cam.ac.uk /starry/coperbooks.html (688 words) |
|