Leonhard Euler Telescope, or the Swiss EULER Telescope, is a national, fully automatic reflecting telescope, built and operated by the Geneva Observatory. It is located at an altitude of at ESO'sLa Silla Observatory site in the Chilean Norte Chico region, about 460 kilometers north of the capital, Santiago de Chile. The telescope saw its first light on 12 April 1998 and is named after the Swiss mathematician Leonhard Paul Euler (1707–1783).