Dunsink

Dunsink Dún Sinche
—  Town  —
Dunsink Location in Ireland
Coordinates: 53°23′14″N 6°20′19″W / 53.387338°N 6.33849°W / 53.387338; -6.33849Coordinates: 53°23′14″N 6°20′19″W / 53.387338°N 6.33849°W / 53.387338; -6.33849
Country	Ireland
Province	Leinster
County	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, north Dublin, Ireland.

Dunsink has an important observatory, where William Rowan Hamilton and Hermann Brück were both 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 8km 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.

Dunsink Observatory

External links

• Dunsink Observatory