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A thousand years before Pythagoras, at the time of the great Pyramids, our ancestors were expending an enormous amount of time and effort erecting stone circles. Were the illiterate farming communities of 2000 BC merely building the equivalents of Wembley Stadium as venues for pagan rituals? Or did their society foster the skills and knowledge necessary to build sophisticated astronomical observatories, to study the motions of the sun, moon and stars? Geoff Watts examines the idea that our forefathers were prehistoric astronomers.