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WilliamParsons, 3rd Earl of Rosse KP (June 17, 1800 – October 31, 1867) was born in Monkstown, County Cork and was an Irish astronomer.
Sketch of the Whirlpool Galaxy by WilliamParsons in 1845
The eldest, Lawrence Parsons, succeeded him as Earl of Rosse and continued some astronomical observations; another son, Charles Algernon Parsons, is known for his commercial development of the steam turbine.