Orion and the stars of the winter sky trailing as they set behind and through Turret Arch, in Arches National Park, Utah. I shot this April 6, 2015 after twilight but before the waning Moon rose, so the sky was dark. Illumination is from stars and the sky – no artificial light provided, and the Moon was not up.
This is a stack of 4 x 8-minute exposures at ISO 250 for the ground and long star trails, plus an initial short 30-second exposure at ISO 4000 for the star points at the start of the trail, all with the Rokinon 14mm lens at f/2.8 and Canon 6D.
The Amazing Sky 