The GranTeCan or the Gran Telescopio Canarias is a 10.4 m telescope located at the Roque de los Muchachos Observatory on the island of La Palma, in the Canary Islands, Spain. Taking seven years to build, it is the world’s largest single aperture telescope with observations beginning in 2007. 36 hexagonal mirror segments controlled by an active optics control system helps solve the mystery behind some of the universe's most powerful radio bursts, amongst other assignments. Imaged here in nautical dusk from the parking of the William Herschel telescope we can see the dome opened to achieve thermal equilibrium before observations start. Star tails in the nautical dusk draw lines in the spectacular sky just after sunset. The bright meteor like streak seen is actually Venus sinking to towards the horizon…