William Parsons, 3rd Earl of Rosse, English-Irish astronomer and politician (died 1867)

William Parsons, 3rd Earl of Rosse

English engineer and astronomer (1800–1867)

William Parsons, 3rd Earl of Rosse, was an English engineer and astronomer. He built several giant telescopes. 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…