Four amazing astronomical discoveries from ancient Greece

This article is a fascinating look at the ancient Greeks’ understanding of Earth and the surrounding solar system, showing what they knew about the planets orbit around the sun, the size of the moon and the Earth’s circumference, as well as their design and use of the first known astronomical, mechanical calculator.

The Histories by Herodotus (484BC to 425BC) offers a remarkable window into the world as it was known to the ancient Greeks in the mid fifth century BC. Almost as interesting as what they knew, however, is what they did not know. This sets the baseline for the remarkable advances in their understanding over the next few centuries – simply relying on what they could observe with their own eyes.