No. 93 (2014) M. Radovanac: ASTRONOMSKA OPSERVATORIJA U BEOGRADU OD 1924. DO 1955. GODINE ASTRONOMICAL OBSERVATORY OF BELGRADE FROM 1924 TO 1955 History of the Astronomical Observatory in Belgrade, as the presentation is done here, become the field of interest to the author of the present monograph in early 2002. Then, together with Luka C. Popovic, during the Conference "Development of Astronomy among Serbs II" held in early April of that year, he prepared a paper entitled "Astronomska opservatorija tokom Drugog Svetskog rata" (Astronomical Observatory in the Second World War). This paper was based on the archives material concerning the Astronomical Observatory which has been professionally bearing in mind the author's position the subject of his work.