nigelswift wrote:
I could just as easily headed the posting "what was the shape of the missing bit"
Sadly it does rather hit Devereux's theory of a 'double sunrise' viewed from the top, if we don't know the original height, maths would probably do it.... Then there is of course Picked Hill sacred hill?, which I contemplated from Knap Hill and reminded me of Silbury, the photograph I took seems to have disappeared.
http://www.themodernantiquarian.com/site/5851/picked_hill.html
p.s.
actually I put it in the wrong place on the Knap Hill site