1800, Jun 171867, Oct 31
an Anglo-Irish astronomer who had several telescopes built. His 72-inch telescope, built in 1845 and colloquially known of as the "Leviathan of Parsonstown", was the world's largest telescope, in terms of aperture size, until the early 20th century. Lord Rosse performed astronomical studies and discovered the spiral nature of some nebulas, today known to be spiral galaxies.
 Gallery (1)

 Timeline (2)
04/13/1842-William Parsons, Lord Rosse, successfully casts 72" (183-cm) mirror, "the Leviathan of Parsonstown," for a telescope
02/15/1845-William Parsons, Earl of Rosse, first uses 72" (183 cm) reflector telescope 
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