Dunsink
| Dunsink Dún Sinche
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| — Town — | |
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 Dunsink
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| Coordinates: 53°23′14″N 6°20′19″W / 53.387338°N 6.33849°WCoordinates: 53°23′14″N 6°20′19″W / 53.387338°N 6.33849°W | |
| Country | Ireland |
| Province | Leinster |
| County | Dublin |
| Government | |
| • Local Authority | Fingal County Council |
| • Dáil Éireann | Dublin North West |
| Time zone | WET (UTC+0) |
| • Summer (DST) | IST (WEST) (UTC-1) |
| Irish Grid Reference | |
Dunsink (Irish: Dún Sinche, meaning "Fort of Sinneach") is a townland near Finglas, Dublin, in Ireland.
There is an important observatory in Dunsink where William Rowan Hamilton and Hermann Brück were directors. It is the oldest scientific institution in Ireland. Built in 1783-1785, the observatory houses a 12 inch (30 cm) refracting telescope which was built by Grubbs of Dublin using a French manufactured lens.
The 1880 Definition of Time Act set the official time in Ireland to be Dublin mean time. This was regarded to mean the time at Dunsink, which was about GMT-25m21. In 1916 another Act moved Ireland to Greenwich Mean Time. Dunsink time is mentioned five times in James Joyce's novel, Ulysses.
The observatory 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.
Dunsink is also the site of a major unofficial Traveller encampment, the subject of considerable media coverage in 2007.
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