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De Leviathan van Parsonstown of de 6-voet telescoop van Rosse was een spiegeltelescoop met een diameter van 1,8 m die de grootste telescoop van de wereld was van 1845 tot de ingebruikname van de 100-inch (2,5 m) Hooker telescoop van het Mount Wilson-observatorium in 1917. De telescoop was gebouwd door William Parsons op zijn landgoed Birr Castle in Parsonstown.
