His passion for astronomy had already driven him to invest in the observatories of Paris, of Montsouris and of the Pic du Midi. When Bordighera did not accept his proposal for an observatory, Bischoffsheim built one in Nice on Mont-Gros, providing it with all the latest equipment and making it a center of excellence. The observatory was opened in October 1887. His contribution to science and society was such that Bischoffsheim received from the French Government the Legion of Honour and in 1889, at the Universal Exposition of Paris, two gold medals: one for the Nice Observatory and another for the professional school of the Boulevard Bourdon in Paris.