Karl Friedrich Gauss was born on 23rd April, 1777 in Braunschweig. Louis-Antoine Crevier was born on 23rd April, 1784 in Saint-Nicolas d'Aliermont. Jacques-Georges Fihue was born on 23rd April, 1793 in La Chaussée (Seine-Maritime). Jules-Frédéric Huguenin (Vuillemin) was born on 23rd April, 1799 in Les Ponts-de-Martel. François Auguste LeCoultre was born on 23rd April, 1811 in Le Sentier. Arséne-Constant Croutte was born on 23rd April, 1819 in Saint-Nicolas d'Aliermont. Edouard Juvet was born on 23rd April, 1820 in Buttes. Louise Argentine Breton was born on 23rd April, 1838 in Saint-Nicolas d'Aliermont. Edouard Huguenin (Bergenat) was born on 23rd April, 1848 in Le Locle. Marie-Joséphine Courant was born on 23rd April, 1851 in Saint-Nicolas d'Aliermont. Clémence-Adelaide Houlvigue was born on 23rd April, 1851 in Heugleville-sur-Scie, Seine-Maritime. Alfred Hübner was born on 23rd April, 1908.
Sylvestre-Antoine Vassard died on 23rd April, 1864 in Saint-Nicolas d'Aliermont.