Rice University
Galileo Project: Longitude at Sea
This site from the Galileo Project of the Rice University provides an in-depth look at the historic problems figuring out longitude. Links are provided throughout this article along with pictures, making this a great site to check out.
Rice University
Galileo Project: Christopher Clavius
This site from The Galileo Project of the Rice University provides a biography of Clavius including an excerpt from his writings. A picture is provided in this article along with links to additional information.
European Space Agency
European Space Agency: Esa Kids: Our Universe: Jupiter
A basic overview of the planet Jupiter. Links to information about the other planets and objects in our solar system are included.