Stonehenge was a Circle

Stonehenge was circular? Well, blow me down | Art and design | theguardian.com: "... Stonehenge may have been a complete stone circle after all. People who work at the site noticed something that has passed professional archaeologists by: traces of two vanished stones. Though they had watered the rest of the site throughout the hot summer, their hosepipe was too short to reach an outer section of the enclosed area on Salisbury Plain. As the ground dried up, the Stonehenge staff saw distinctive parch marks that turned out to be tell-tale signs of the lost megaliths. This is a great day for amateur archaeologists. Enthusiastic, untrained eyes have discovered something really significant... For Stonehenge is not the only stone circle raised in Neolithic Britain. The village of Avebury in Wiltshire is surrounded by a vast stone circle as well as a huge circular earthwork. There’s no question the stones at Avebury form a circle. So do those at Stenness, Orkney, at the other end of the British Isles. These “Henge” monuments and others around Britain are so consistently circular that the existence of circles must surely be part of their meaning. The geometric feat of mapping out a circle, presumably using pegs and cord, was no mean achievement for a pre-literate people. Many prehistoric mounds like Silbury Hill near Avebury are also circular. Are all these cosmic circles meant to mirror the shapes of the sun and moon as they look to the naked pre-scientific eye?..."