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.