Season 11 Episodes13
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From 1845 until 1917 the biggest telescope in the world was the 72-inch reflector built and operated by Lord Rosse at his Irish home. Patrick Moore visits Birr Castle in County Offaly, Eire, to discuss with the present Lord Rosse his great - grandfather's remarkable achievement
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"Lord Rosse's Great Telescope" is episode 8 of The Sky at Night season 11. It aired on July 21, 1967.