Smithsonian Institution
National Air and Space Museum: Exploring the Planets: Early Discovery
This section of the exhibition gives the history of the discovery and study of space starting with the Greeks and Romans through to the early 1900's.
Views of the Solar System
Views of the Solar System: The Solar System
Explore the solar system through this site that includes vivid multimedia resources. Learn the latest scientific discoveries, the history of space exploration, and much more. Site includes videos, graphics, articles, and photographs.
Smithsonian Institution
National Air and Space Museum: Exploring the Planets: Ancient Times & the Greeks
In ancient times only five planets were known: Mercury, Venus, Mars, Jupiter, and Saturn. Learn about Greek astronomer Ptolemy's theory for the solar system that was to survive for fourteen centuries.
University of Virginia
University of Virginia: How the Greeks Used Geometry to Understand the Stars
An article explaining how the Greeks were able to use their science and mathematics to predict where astronomical objects such as the Planets could be found in the nighttime sky even though their underlying premise was that the earth did...
Other
Astro Mia: Tierra, Sistema Solar Y Universo
This site is a good resource to study Astronomy. It has six sessions: the Universe, the solar system, the earth and the moon, history of Astronomy, articles, famous astrologers and a glossary.
Cornell University
Cornell University: Astronomy: Aristarchus
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.
CK-12 Foundation
Ck 12: Earth Science: Revolutions and Rotations of the Earth Study Guide
[Free Registration/Login may be required to access all resource tools.] Summarizes the key points about how our understanding of the Earth's movements evolved from ancient times and what we know today. Includes some questions to check...