Season 31 Episodes13
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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
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"The William Herschel Telescope" is episode 7 of The Sky at Night season 31. It aired on July 12, 1987.