1. 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. 2. Nicolaus Copernicus - Introduces the father of modern astronomy. 3. 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. 4. Nicolas Copernicus - A short biography (1473-1543). 5. Nicolaus Copernicus - Discovered that the Earth is not in the center of the Universe but it circles the Sun. Facts of life and pictures of the Polish astronomer. 6. Nicolaus Copernicus - Detailed biography examines Copernicus' dissatisfaction with the Ptolemaic system of astronomy and his theory that the earth actually revolved around the sun. Also includes portrait. 7. Nicolaus Copernicus - Life and works. 8. Squashed Copernicus - An abridged version of "Revolutions". Includes study notes, diagrams and glossary.

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