nigelswift wrote:
Not every day as the sun's slope only corresponds with Silbury's slope on a certain number of days but if you're willing to settle for a "short roll" or to move around you can increase the number of days.
Here's another downwards one http://www.youtube.com/watch?v=nmO2rlAr0JY&feature=relmfu
If you want good evidence of intentionality though, what's needed is a tunnel straight through it. How cool would that be?! ;)
I think I have seen all of these , none are from the same spot or it's only a bit of the hill that the sun is seen to roll up/down more importantly it tdoesn't work at equinox .In this case once again the observation point was moved to accomodate the fact the sun was drifting from the same angle as the slope also the whole of the slope was never going to be included as Knoll Down ? was getting in the way too .
