In the early evening sky of Canary Islands, the young crescent moon shines above the Roque de los Muchachos Observatory on the top of La Palma, 2400 meters above see level. There are about a dozen major telescopes on this excellent observing site including the 3.6 meter TNG (Telescopio Nazionale Galileo, belongs to Italy) just below the moon and one of the world's largest telescopes the 10.4 m GTC (Gran Telescopio Canarias) at the right end which belongs to Spain.