Mather Point at Dusk, Grand Canyon ©2016 James D. Peterson. This image was made during the "blue hour", which starts around half an hour after sunset. The light source was a combination of sky light from the fading sunset (from the left in this image) and moonlight from a half moon to the right behind me. The few stars visible are semared by a long exposure, and the light from the Desert View watchtower is barely visible on the horizon on the right.