The astronomers met in Florence at the Museo di Fisica e Storia Naturale on September 22-25, 1869 to choose the locations for the astronomical stations and the instruments, and to plan the scientific activities.
INAF-Osservatorio Astronomico di Capodimonte, Archivio Storico, Attività Scientifica, Corrispondenza Scientifica, B. 1, f. 2