JOHN SIBBICK / SCIENCE PHOTO LIBRARY JOHN SIBBICK / SCIENCE PHOTO LIBRARY
Building Stonehenge, illustration. There have been a number of stones and structures erected at the Stonehenge site, on Salisbury Plain, England. This is the construction period from around 2600 BC to 2400 BC, forming the structure seen today. Large sarsen stones were erected to form a 30-metre-wide ring, with other stones erected to form a central horseshoe shape. Erected by neolithic peoples, some of the stones are thought to form markers that indicate rising and setting points for the Sun and the Moon, allowing accurate prediction of forthcoming lunar and solar eclipses. It is not known how the stones were erected. This illustration shows the theory that the builders used a system of rolling log tracks to transport them, and A-frame shear legs to lift them into place.
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