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Well after a couple of hours work last night, here are the results.
Along the axis of the Avenue, there's a 134m high bump in the landscape just north west of Durrington Walls which blocks the view of the point I chose on Sidbury Hill's southern flank.
Here's that plot:
However, that 134m bump is only a few tens of metres wide, and by shifting gaze about 0.5° to the north of the Avenue axis, two things happen.
1) You're now looking at the highest point of Sidbury Hill, instead of towards the southern flank
2) You're looking over a 125m ridge, not at a 134m bump.
Here's that plot:
I now suspect that (if the modern trees weren't in the way) you'd see a notch in the landscape between Sidbury Hill on the left in the far distance (8 miles) and the 134m bump NW of Durrington Walls on the right in the near distance (2.5 miles) - and the Sun would rise through that notch on the summer solstice.
--
simon
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