No - I didn't suggest that the sunset was visible behind Amos Hill from the Thornhope stone row, just that that was the roughly calculated declination. There's no line of sight nowadays, anyway, due to trees and a wall. There is an open sightline, but it's further north, to the edge of Glendue Fell, where there's a cliff edge - which is not resolved in GoogleEarth. The builders, to get a good view of the summer solstice sunset, made one a hundred feet higher up the hill, where the horizon is Black Rigg.