Slaggyford Stones 1
Image by StoneGloves

StoneGloves wrote:
"Of course you can see the sun set behind Amos Hill , if you stand right next to it . But it is impossible to see it from the line of stones at Thornhope , which is where you suggested , no matter how much you brainstorm it will never be true .
You don't need GE to work that out ".

your GoogleEarth has deficits, on a major scale.
Because the stone row is lower than the top of Amos Hill - even after its slumped a metre or so - you are looking up at it and the horizon is actually the field behind the hill, at the centre, with Black Hill rising to the left. During spring and autumn the sun, from the stone row, sets behind Black Hill. At the solstice - and a few days before and after - the stting sun moves out from the obscuring Black Hill and appears to roll down its edge. Which has a steep edge at about NY662532. I've never seen it properly, just half, in half out, on the nineteenth.

There is a fallen stone beyond the row, which I assume was an outlier, and that seems to be the best spot to watch these summer sunsets from as the view from the row itself is impeded by a stone wall and scrub trees.

Why do you keep going on about google earth , surely you realise there is a bit more to working out this type of thing , or maybe you don’t .

You contradict yourself in these two paragraphs ,in the first you are saying that from the “stone row” and looking up at Amos Hill the horizon is the field behind the hill then in the second you are saying the view from the “stone row” is impeded by a stone wall and scrub .
Regardless it is as I said in the first post about this . Without the scrub and wall when looking from the line of stones over Amos Hill the horizon would be Glendue Fell but you would never see the sun set there as it is too far north .Similarly the sun would not be seen to set from the stones over Black Hill or the grid ref you gave with these points on the horizon , Glendue Fell is still the horizon and the orientation is still too far north .

"Glendue Fell is still the horizon and the orientation is still too far north".

The local historians wonder how somewhere near the border of Cumbria and Northumberland achieved a Scottish name (and there is no consensus). My azimuth for the summere solstice sunset - without correction for the altitude of the horizon - is 313.91 degrees. It is confusing that part of Glendue Fell is called Black Fell and that the hill in front of it is called Black Hill. These are ordnance survey names and the local farmers use different ones. Hanging Shaw allotment, for instance.

It's odd that I watched many years sunsets in that place and that you are telling me what I can't have seen. It's a bit back to front. (It's a lot back to front). It's odd that I didn't photograph any sunsets, only sunrises. So now you're saying that what I saw is impossible, because the sun doesn't go that far north? And you're saying that the sun sets behind Glendue Fell and not behind Black Hill? I'd suggest you check your data points. From the Knar valley, on the south side, where I'd often work, we'd watch the sunsets moving further north. Eventually they'd reach this huge pile of stones, on the horizon. Then the sunsets would move away again, back to the south. Then they took the pile of stones away and made a road with it. I was told that if I interfered with the roadmaking I would disappear. That's not in your GoogleEarth!