This image is from my first trip to Pemaquid Point a few weeks ago. It was taken during nautical twilight and the sun is till an hour away from rising. To the naked eye it was still very dark but the 30 second exposure at F2.8 and ISO 3200 shows the sun is bright enough to light up the sky even though it was well below the horizon. Also, this is a focus stack of two photos, one with the lens set at infinity for the sky and lighthouse, the second one focused on the foreground rock. The two were blended in Photoshop.