... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . Full Programme in PDF format . The City of Armagh and Armagh Observatory are honoured to be hosting the Ninth European Symposium for the Protection of the Night Sky, an international conference from 17th to 19th September to discuss light pollution and its impact on astronomy and our view of the night sky, and its effect on the natural environment, education, wildlife and public health. ... Dark Skies Campaign . ...