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Dunsink

Townland near Dublin, Ireland

About

Dunsink (Irish: Dún Sinche, meaning 'fort of Sineach') is a townland in the civil parish of Castleknock, Dublin, in Ireland. The townland has an area of approximately 1.7 square kilometres (0.66 sq mi), and had a population of 323 people as of the 2011 census. It is around 7 km north-west of the city centre, near the junction of the N3 and the M50 roads.

The townland is the site of Dunsink Observatory, where William Rowan Hamilton and Hermann Brück were directors. Built in 1783–1785, it is the oldest scientific institution in Ireland. The observatory houses a 12-inch (30 cm) refracting telescope which was built by Grubbs of Dublin using a French manufactured lens. It is situated on a hill 8 km northwest of Dublin's city centre, where the astronomy section of the School of Cosmic Physics in the Dublin Institute for Advanced Studies is located.

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