Building on the Solstice
Ancient buildings have long reflected people's fascination with the sun. Stonehenge is perhaps the best known of these stone structures. Another prehistoric stone building, in Newgrange, Ireland, and dating from about 3,300 BCE, allows sunlight to penetrate to the back of the cairn only at sunrise on the winter solstice. The neolithic cairn at Maeshowe on the Orkney Islands lets in the setting sun on the same day. And the Bighorn Medicine Wheel in Wyoming, one of 40 or more similar "wheels" found in the Rocky Mountains, serves a similar astronomical function.