As the first rays of the sunrise strike this incredible cloud formation, meanwhile the moon is about to bow out setting on the left. Although the entire scene was spectacular to take in what really caught my attention was the line going vertically down the through the sky and across the middle of the moon. A visual representation of the boundary between night and day in a way I had never seen before and haven’t since. Even when I used to fly I don’t recall seeing the boundary line look like this