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gjrk wrote:
"..........."

Thanks George. Still scratching the head on your eclipse possibility...

ooops nearly forgot . Not great and missing quite a lot of relevant info but this may help . Claus wrote a paper but it's in the relatively obscure "Acta archaeologica " vol 79 2008 pp216-229
http://www.eurekalert.org/pub_releases/2008-12/uoc-pgf121808.php

Sorry, George. I'll give it a think-over and reply in a day or two, when I get my head around it. Probably a lot of 'ifs', but on the surface it looks tempting.