Children's Museum
Children's Museum: Field Guide to the Universe: Astronomers
Read brief biographies of astronomers who are grouped by time period.
Other
University of Cambridge: Tycho Brahe
The Department of History and Philosophy of Science at Cambridge University provides biographical information on Tycho Brahe, the most famous obervational astronomer of the sixteenth century.
Other
Platonic Realms: The Irrationality of the Square Root of Two
An informative resource on the nature of Platonic Solids and what constitutes these figures.
Sonoma State University
Sonoma State University: The Copernican Revolution
This site has a time line featuring discoveries, and publications which sprang from Copernicus's publication of De Revolutionibus in 1543, and the people active in the field of physics between 1543 and Newton's death in 1727.
Curated OER
Rice University: The Telescope
This site from The Galileo Project of the Rice University provides an in depth history of the telescope and it's invention and growth over time. Too detailed for an Elementary student, but a great resource for an Elementary teacher.