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Published online by Cambridge University Press: 03 August 2017
T.N. Thiele participated in the astrographic conference in Paris 1887 and was the first theoretician to reduce and analyse the photographic plates of the Henry brothers. He was an enthusiastic supporter of photographic astrometry because of its elimination of personal errors. However, for different reasons he did not want the Copenhagen Observatory to take responsibility for a Carte du Ciel zone. Thiele's life and work and his plans for the development of astrometry are presented.