the seven layers of hill I counted must have been a different shot. Anyway ...
came up out of the valley and could see that the sun was all ready to go down, so drove to a known layby. The sun was complete when I got there - but there was a gritter coming, so I had to take a shot of that. Gritter pic = 1734hrs // first sun pic = 1734hrs // sun completely disappeared = 1739hrs. Amazingly quick!