I think what comes out of this video is the fact that Burl was meticulous in his recordings of the stone circles. I always remembering him writing about the wild purple aquilegia he found on one of the sites in Ireland. Also the story that the Ash tree was the Yggdasil Tree of Odin fame and from which he hung for nine days. If you counted the buds opening in spring, there should be nine, not true sadly I have counted 11 or 13.