some relations between the stockholm and tartu observatories during the 19th century

This article introduces the Royal Swedish Academy of Sciences and the old Stockholm Observatory. It focuses on the Swedish astronomers Jöns Svanberg and Nils H. Selander, and on their work with the Struve Geodetic Arc. The particular relations to the Tartu Observatory through Oskar Backlund and the contemporary Swedish astronomers in Stockholm are traced.