
William Parsons
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William Parsons, the 3rd Earl of Rosse, was an Irish astronomer known for constructing the Birr Telescope in 1845, which was the largest telescope in the world for 70 years. He made groundbreaking observations, including the first sighting of spiral galaxies, solidifying his legacy in the history of astronomy.
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A naval captain who joined the mission and had witnessed the atomic bomb test in New Mexico.
‘You don’t brag about wiping out 60‑70,000 people’: the men who dropped the atomic bombs on Hiroshima and Nagasaki | Nuclear weaponsThe Guardian·
United Kingdom· 2025-06-22
The Birr Telescope, built by William Parsons in 1845, was the largest telescope in the world for 70 years.
Ireland’s astronomical observatories to be put forward for international recognition from Unesco – The Irish TimesThe Irish Times – major Irish daily, est. 1859·
Ireland· 2025-04-17















