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Stonehenge itself remains a steadfast observer of the world, watching the seasons change from summer to fall to winter to spring and back again thousands of times over. But it also bears witness to movements in the heavens, observing the rhythm of the Moon and, more noticeably, the Sun. For most parts of the year, the sunrise can't even be seen from the centre of the monument. But on the longest day of the year, the June 21st summer solstice, the rising sun appears behind one of the main stones, creating the illusion that it is balancing on the stone.
Just as the Sun clears the horizon, it appears to hover momentarily on the tip of the Heel Stone. A few days later, on midsummer's day, the sun will appear once again, but this time, it will begin to move to the right of the heel stone. The same phenomenon happens again during the winter solstice, only it's in the opposite direction and a sunset. But both indicate a change of season.
But who would have needed to make this connection between Earth and Sun. The first builders, who may have just started farming the land, might have needed to know when the seasons were about to change. At a later phase in its development, Stonehenge may have been used as some sort of temple, or it could have been an astronomer's tool, used to judge the movements in the heavens.
"Nobody really knows at all what [Stonehenge] was intended for," says Christopher Witcombe, a professor of art history at Sweet Brian College in Virginia and an authority on Stonehenge. "The fact that it was built over a long period of time makes it difficult to know if it maintained the same function over the time period or not."
But this doesn't mean there aren't a number of theories that set out to explain Stonehenge's purpose. Eighteenth century British antiquarian, William Stukeley, was one of the first people to report seeing the event of the sunrise on that special day in June. This led him to believe that Stonehenge was a temple, possibly an ancient cult centre for the Druids. Although this theory isn't as popular now, the religious aspect attributed to Stonehenge has influenced how it has come to be understood, even today.
"When people started paying attention to Stonehenge, back in the 18th century, people like William Stukeley were calling it a temple," says Witcombe. "That sort of association has been more or less attached to Stonehenge for the last two or three hundred years." Others, like 20th century British astronomer, Sir Norman Lockyer,also saw Stonehenge as a temple, but a temple to the Sun. For him, its significance lay in elebrations of ancient Celtic festivals. But to see Stonehenge as a temple, or retaining a religious quality may just be an assumption. It is a structure that clearly does not resemble a house or hall or anything else secular, which could indicate that it is sacred, according to Witcombe.
"We're also influenced by the fact that a lot of the more complex buildings that survive from the ancient past, like in Greece and Egypt, are buildings that are religious," says Witcombe. "We are presuming that's also the case with Stonehenge." There are also more than 400 burial mounds surrounding the ancient monument. Many of these graves have been found to contain gold breast plates and other precious metal items. These people may have wanted to be buried close to Stonehenge, which could reinforce a spiritual aspect, or as modern day astronomer Gerald Hawkins says in his book, Beyond Stonehenge, a concern for life after death.
A side view of the trilithon horseshoes. (photo courtesy and copyright Cliff Wassmann) In the middle of the 20th century, a new theory was born -- one that suggests that Stonehenge could have been used as an astronomical calendar, marking lunar and solar alignments. If this is true, it would have held great power for the people who controlled the megalithic monument. "Astronomers, just because of what they were able to do, must have seemed, to the ignorant, something esoteric and mystical," says Witcombe.
Aside from the sarsen horseshoe trilithons that open in the direction of the sunrise, there are four stones, called "Station Stones" that may have played an astronomical role. These were placed in a rectangle around the main monument, within the ditch and bank that surrounds the circle of stones. These are believed to point out the moonrise, moonset, sunrise and sunset.
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