71 pages of wonderful stuff - download it!
One passage stood out because it links into my theory that the flat faces of the Great Trilithon also mark the Midwinter sunrise and sunset - see my pdf.
In contrast to the other trilithons, the internal faces of the Great Trilithon are vertically convex, while the exterior faces are perfectly flat. The exterior faces have also been finished to a very high quality, indicating that the area behind this trilithon was an important location. Indeed, it is no doubt significant that midsummer sunrise can be observed from this point along the NE-SW axis of the monument.
Apologies for any mistakes in the copied text but EH have made their pdf
"uncopyable", but we have ways to do it....