Star map - doesn't work. Near to precious (in the cultural sense) metal deposits - well that's also where they lived like we used to live near coal mines. Tree rings - very neglected, as is the study of prehistoric joinery (all the old bits were burnt so there's hardly any remaining. What about the ripples in a still pool symbolising the life experience? Something neglected totally by modern day researchers is their measurement. They seem to be laid out in something called a Megalithic Inch - also called the Acupuncture Unit of Measurement (AUM). Nobody knows, really, but why are the Megalithic Inches suppressed? It's not as if joiners wouldn't measure things then - just as they do now.