Beobachtung des Procyon als Doppelstern. Offprint from Mélanges mathématiques et astronomiques tirés du Bulletin de l’Académie impériale des sciences de Saint-Pétersbourg (dated 27 March/8 April 1873).
[St. Petersburg: 1874]. First edition, extremely rare offprint, of Struve’s ‘discovery’ of the faint companion to the star Procyon, which together form a binary system. This offprint is accompanied by two signed autograph letters from Struve to the Scottish amateur astronomer Robert Stirling Newall (1812-89), who at the time owned..... More
Item #4324