... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . An Exhibition at the Armagh Observatory to mark the Archive Awareness Campaign: . ... The Archives of Armagh Observatory . ... Armagh Observatory: the early years . ... National Library of Ireland). The roots of the cathedral city of Armagh stretch back almost 4,000 years. ... The Book of Armagh, a Latin manuscript now retained in the Trinity College Library, Dublin, was a product of the early years of the 9th century. ...