On a clear day is it possible to see the Isles of Scilly from Cornwall with the aid of binoculars? A distance of around 40km.
I know on a very clear day you can only see maximum 20km from sea level but the coast of Cornwall is higher than sea level. So does the height advantage of the cliffs enable you to see further across the horizon?
There are a couple of online forums that suggest you can see the Isle of Scilly from Cornwall but no photographic evidence.