Diodorus also says that in that area Apollo (meaning, the sun or the moon) "skimmed the earth at a very low height". If Mercer's theory is correct then the bluestones may have been transplanted to cement an alliance or display superiority over a conquered enemy although this can only be speculation.
However, both the moon and the sun always move far above the horizon at the latitude of Stonehenge; it is only 500 miles farther north that they can be observed to remain near the horizon. An oval-shaped setting of bluestones similar to those at Stonehenge 3iv occurs at Bedd Arthur in the Preseli Hills, but that does not imply a direct cultural link.
This allows the elimination of a few of the theories that have been presented.
Whilst at Mount Killarus, Merlin laughed at the soldiers' failed attempts to remove the stones using ladders, ropes and other machinery.Shortly thereafter, Merlin oversaw the removal of stones using his own machinery and commanded they be loaded onto the soldiers' ships and sailed back to England where they were reconstructed into Stonehenge.From this work, he was able to demonstrate an astronomical or calendrical role in the stones' placement.The architect John Wood was to undertake the first truly accurate survey of Stonehenge in 1740.While there have been precious few in the way of real theories to explain who built the site, or why, there can be an assessment of what is known to be fact and what has been disproven.
Radiocarbon dating of the site indicates that the building of the monument at the site began around the year 3100 BC and ended around the year 1600 BC.Additionally, the Druids are unlikely to have used the site for sacrifices, since they performed the majority of their rituals in the woods or mountains, areas better suited for "earth rituals" than an open field.The fact that the Romans first came to the British Isles when Julius Caesar led an expedition in 55 BC negates the theories of Inigo Jones and others that Stonehenge was built as a Roman temple.The main source of the bluestones is now identified with the dolerite outcrops around Carn Goedog although work led by Olwen Williams-Thorpe of the Open University has shown that other bluestones came from outcrops up to 10 km away.Dolerite is composed of an intrusive volcanic rock of plagioclase feldspar that is harder than granite.Some archaeologists have suggested that the igneous bluestones and sedimentary sarsens had some symbolism, of a union between two cultures from different landscapes and therefore from different backgrounds.