Nicolaus Copernicus
- Life and works.
- http://plato.stanford.edu/entries/copernicus/

Modern History Sourcebook: Nicolas Copernicus
- Gives excerpts from the scientist's works. Lists the astronomer's reasons as to why the earth must be round, such as pointing to the different times that peoples from different geographic regions see the moon appear at night.
- http://www.fordham.edu/halsall/mod/1543copernicus2.html

Squashed Copernicus
- An abridged version of "Revolutions". Includes study notes, diagrams and glossary.
- http://www.btinternet.com/~glynhughes/squashed/copernicus.htm

MSN Learning & Research Plus: Copernicus, Nicolaus
- Encyclopedia article provides an overview of the astronomer's early life, his education, and his revolutionary theory that the earth was not the center of the universe.
- http://encarta.msn.com/encnet/refpages/RefArtContent.aspx?refid=761571204

Nicolas Copernicus
- A short biography (1473-1543).
- http://www.blupete.com/Literature/Biographies/Science/Copernicus.htm