In 2015 Pedersen discovered a collection in the archives of the Bohr Institute of more than 150 photographic plates of astronomical observations , shot from 1895 to 1957 . The glass plates were well preserved and clear shots of lunar eclipses , the stellar constellations and the passing of the 1957 Comet Arend – Roland . Pedersen called the find exciting , as per their being archaeoastronomy , showing how humans saw the sky a century ago . Especially interesting among the plates in the collection is a rare copy of a plate of a solar eclipse shot in 1919 by English astronomer Arthur Eddington
solar eclipse
Solar eclipse of May 29, 1919
Holger Pedersen (astronomer)