German astronomer (1886-1933) from the prolific Struve family, who analyzed the movements of the moons of Saturn and Uranus. ALS in German, signed “G. Struve,” one page both sides, 8.25 x 11, University of Chicago Astrophysical Journal letterhead, July 11, 1928. Untranslated letter to Cambridge astronomer Arthur Beer. In fine condition. Accompanied by two of Beer's retained handwritten drafts of letters to Struve.