The Historical Archives of the Armagh Observatory comprise documents relating to the Buildings and Administration, Astronomical Drawings, the Papers of the Directors and Staff, and Documents concerning Railways. The papers detailing the administration of the Observatory include items such as the printed Act of the Irish Parliament setting up the Observatory in 1791, with the 1938 amendment, Minute ...
The Opik papers reflect the lifetime interests and scientific activities of Dr E J Opik, one of the foremost astronomers of his generation. He was Research Associate at the Armagh Observatory from 1948 until 1981 and Acting Director of the Armagh Observatory from 1974 - 1976. The papers consist of his scientific correspondence including referee reports, and manuscripts of his major publications.