(Go to: http://gkhales.blogspot.co.uk/2012/06/whats-that-coming-over-hill.html & http://gkhales.blogspot.co.uk/2012/06/more-archaelogical-obfuscation.html )
"Geo" - "Metry" = "Earth/(ground)" - "Measurement" The Pythagorian Brotherhood were it seems taught their "spacial-math" by the (for want of a better description), "Brythonic Hyperboreans", .. (both "druid" and "celt" are Romanised terms and do not apply at all to Briton until after the second -successful-, Roman invasion).
Also see; "We've got you surrounded!" (The threats to our bodies' bio-magnetic fields) Go to: http://gkhales.blogspot.co.uk/2014/06/weve-got-you-surrounded.html
, Oppose; "plans for a tunnel to bypass the neolithic site" Go to: http://gkhales.blogspot.co.uk/2014/12/oppose-plans-for-tunnel-to-bypass.html
, ""The Cerridwen" an Update on the Mesolithic, Neolithic and Bronze Age Landscape" Go to: http://gkhales.blogspot.co.uk/2014/01/the-cerridwen-update-on-mesolithic.html
, ""Beth-Luis-Fearn" The "Brythonic" Tree Calendar" Go to: http://gkhales.blogspot.co.uk/2014/02/beth-luis-fearn-brethonic-tree-calendar.html
& "The Antikythera Mechanism Research Project" Go to: http://gkhales.blogspot.co.uk/2012/09/the-antikythera-mechanism-research.html
Also see; "I Suspect a Chimera" Go to: http://gkhales.blogspot.co.uk/2015/11/i-suspect-chimera.html
Nb. It is important to realise (re: "Ley Lines"), that these coincidences and serendipities came about as a result of the harmonic relationship between the various cultures concerned (and their own vernacular environments), actual physical contact developed much more slowly and would have been "controlled" by the adminstration (the priestly class).