While starting to dedicate every year of its activity to a major event or outdoor initiative, the Bologna Astronomical Observatory has decided to begin by naming 1999 as "the year of Guido Horn d'Arturo". This decision crowns a series of initiatives that were taken along the same year in honour of Horn d'Arturo, and namely:
- the acquisition of the donation of the wide personal [epistolario] written by Horn d'Arturo between 1912 and 1939, now The Guido Horn d'Arturo fonds;
- the [intitolazione] of the renovated astronomy library;
- the publication of books and articles;
- the approval by the local authorities of Bologna and Trieste of the proposal to name two streets of these cities after Guido Horn d'Arturo.
Guido Horn d'Arturo - a scientist, a scholar, a victim of antijudaic persecutions - was already alive in the memory of astronomers, also because his name was given to an asteroid (n.3744), to the Bari Amateur Astronomers Association and to the Bologna amateur telescope. These new initiatives are meant to consolidate his place among the most noticeable Italian astronomers of the XX century.