William Parsons, 3rd Earl of Rosse, was an Irish astronomer and politician. Born in 1800, Lord Rosse constructed the Leviathan, a 72-inch aperture (1.8m) telescope located at Birr Castle in County Offaly, Ireland. The instrument remained the largest ever built until 1917 when it was superseded by the 100-inch (2.54m) Hooker telescope at Mount Wilson Observatory.
Image: William Parsons, 3rd Earl of Rosse (Royal Institution of Great Britain/SPL)
A 19th century Irish astronomer builds the world's largest telescope.
Pete Lawrence explains how to find the Crab Nebula.
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Patrick Moore discusses supernovae and the famous Crab.
Sir Patrick Moore and his guest Professor Sir Francis Graham-Smith discuss supernovae that create clouds of gas like the famous Crab Nebula.
William Parsons, 3rd Earl of Rosse KP PRS (17 June 1800 – 31 October 1867) was an Anglo-Irish astronomer who had several telescopes built. His 72-inch telescope, built in 1845 and colloquially known as the "Leviathan of Parsonstown", was the world's largest telescope, in terms of aperture size, until the early 20th century. From 1807 until 1841, he was styled as Baron Oxmantown.