Tragedy struck his family in 1807 when his wife's son, who had previously been Delambre's assistant, died in Naples at the age of 26. Delambre attained further achievements in his career, however, including his appointment to the chair of astronomy at the Collège de France in Paris in 1807.
Trahedya Struck kanyang pamilya sa 1807 kapag ang kanyang asawa ang anak na lalaki, na dati ay Delambre's assistant, namatay sa Naples sa edad na 26. Delambre attained karagdagang mga tagumpay sa kanyang karera, gayunpaman, kasama ang kanyang appointment sa silya ng astronomy sa kolehiyo de France sa Paris sa 1807.