Other
Explorable: Ancient Astronomy, Science and the Ancient Greeks
Discusses the influences of other cultures on ancient Greek astronomers, and the advances made by the Greeks. It highlights major astronomers and those who contributed important ideas from the 6th to the 2nd centuries BC, including...
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.
World History Encyclopedia
World History Encyclopedia: Greek Astronomy
Looks at the history of Greek astronomy from the 4th century BC on, and the major figures who contributed ideas. Includes a timeline of Greek science.
University of St. Andrews (UK)
University of St. Andrews: Greek Astronomy
Provides an overview of ancient Greek astronomy and the major figures who played a role in developing ideas about the Universe.
Other
Ellinogermaniki Agogi: Eratosthenes Experiment
A profile of the ancient Greek mathematician, geographer, and astronomer, Eratosthenes. Looks at his many accomplishments, including measuring the circumference of the Earth and the distance to the Moon and the Sun. Includes links to...