John Louis Emil Dreyer

John Louis Emil Dreyer (13 February 1852 – 14 September 1926), also Johan Ludvig Emil Dreyer, was a Danish astronomer who spent most of his career working in Ireland.

His father, Lieutenant General John Christopher Dreyer,[5] was the Danish Minister for War and the Navy.

When he was 14 he became interested in astronomy and regularly visited Hans Schjellerup at the Copenhagen observatory.

During 1878 he moved to Dunsink, the site of the Trinity College Observatory of Dublin University to work for Robert Stawell Ball.

In 1882 he relocated again, this time to Armagh Observatory, where he served as Director until his retirement in 1916.