http://www.sciencedaily.com/releases/2008/02/080211133105.htm
Red light travelling up the passage, if you want to think of it in terms of Newgrange.
I was wondering, rather than Europe-wide, what the local counterpart would be and found the following in Burl's Prehistoric Avebury (p111). Again, I should say that I've never seen any of these in the flesh, but I assume that he knows what he's on about ;)
"Before its blocking the shallow crescentic forecourt at West Kennet was probably used for open-air ceremonies.../ At Wayland's Smithy...stones almost as high as West Kennet curve outwards on either side of the entrance, marking out a shallow forecourt.../ A crescent-shaped forecourt may also have existed at the ruined Devil's Den.../ the destroyed Old Chapel...had a very deep forecourt...semicircle of great stones..."
Reaching, but tempting?
You must have explained the above very well Gordon because I almost understand what you are saying.
This was also helpful in understanding the phenomenon of why a red moon occurs - http://wiki.answers.com/Q/What_causes_a_red_moon
From here on the calculations concerning WKLB are too difficult for me to get a handle on but I am following the debate from the back of the class - and am paying attention.
tjj