Daniel Georg Lindhagen, Swedish astronomer.
Worked at Pulkovo 1847-1855, then at the Stockholm observatory. Photograph
by Johannes Jaeger, Stockholm. Original in Gustav Holmberg's collection.
Heinrich Louis d'Arrest, Danish astronomer.
Worked on the spectra of red stars. Photograph in the collection Astronomiskt
Porträttgalleri, collected by Bernhard Hasselberg, Uppsala University
Library, Pictures and Maps Division.
Knut Lundmark, Swedish astronomer, professor
at Lund observatory. Worked on the distance of the nebulae and the history
of astronomy. By using novae as distance indicators, he argued in 1919
that M31, the Andromeda nebula (as it was then called) in fact was a distant
stellar system, much like our own. He was very active in the popularization
of astronomy. Photograph taken c. 1937, showing Lundmark at the Lund observatory.
Photograph in the collection of Lund