Astronomy Picture of the Day

Explanation: Through crystal clear skies this beautiful panorama follows the curve of planet Earth's shadow rising across the top of the world. The tantalizing twilight view is composed of eight single frames captured from 4,000 meters above sea level at sunset on April 6. Just above the dark grey Earth-shadow boundary lies a fading, pinkish, anti-twilight arch. Also known as the belt of Venus, its reddened and back-scattered sunlight finally merges with the still blue eastern sky. Standing tall near center along the rugged horizon line is the distant sharp peak of Mount Damavand in the snowy Alborz mountains. A feature in Persian mythology and literature, Damavand is a stratovolcano reaching 5,610 meters above sea level, the highest peak in Iran and the Middle East.