The University of Virginia provides notes from a lengthy lecture given on the life of Johannes Kepler. This site has GREAT information and is easy to understand.

This article explains the life and scientific discoveries of Johannes Kepler.

This article will take you through the life and accomplishments of Nicolaus Copernicus.

This site provides a biography of Nicolaus Copernicus. Content includes pictures, cross-references to relevant history topics, a list of honors awarded to Copernicus, and more.

This site gives an extensive discussion of Aristarchus' accomplishments in determining the size of the sun and moon and in proposing a sun-centered universe.

In-depth information site on Venus, complete with a thorough glossary, links to a wide array of related sites, thumbnail picture files linked to larger images, and even a short audio file from a classic symphony.

[Free Registration/Login may be required to access all resource tools.] How objects in the solar system orbit around each other.

This site from Cornell University provides a discussion of how Aristarchus arrived at his conclusions of the distance from the Earth to the Sun and Moon. Also has his methods for determining the size of the Moon and the Sun.

[Free Registration/Login may be required to access all resource tools.] How objects in the solar system orbit around each other.

This site from The Galileo Project of The Rice University provides a list format biography of Copernicus. The topics that are covered in this biography include: dates, father, nationality, education, religion, means of support, and so on.

The Nicolai Copernici Museum has a timeline containing major events in Copernicus's life.

The notable English scientist and mathematician Sir Isaac Newton lived from 1642-1727. This site is a brief biography.

Excellent resource for "paper-plate" activities that help simplify various astronomy topics. Learn how to build a "Moon Finder" and "Planet Pointer," and create a paper-plate model that explains the Transit of Venus.

Nicolaus Copernicus (February 19, 1473 - May 24, 1543) was the first astronomer to formulate a scientifically based heliocentric cosmology that displaced the Earth from the center of the universe. His epochal book, De revolutionibus...

This is a portrait of the famous astronomer Nicolaus Copernicus. Copernicus devised a heliocentric model of the universe that differed from other theories at the time.