The Sky at Night — Episode 7: The William Herschel Telescope

You are watching the episode The William Herschel Telescope Coming into operation shortly is a telescope that is not only one of the largest in the world, but probably the most accurate. The William Herschel telescope is on the summit of an extinct volcano on La Palma in the Canary Islands. Patrick Moore visits the telescope and talks to the astronomers who have been closely connected with its development.