Dieudonné LHoest was born on 18th September, 1778 in Lüttich. Alexandre-Félix Lejoille was born on 18th September, 1812 in Saint-Nicolas d'Aliermont. Jean Bern. Leon Foucault was born on 18th September, 1819 in Paris. Victor-Ernest Helie was born on 18th September, 1857 in Envermeu near Saint-Nicolas d'Aliermont. Jules-Louis Lemonnier was born on 18th September, 1863 in Dieppe (Seine-Maritime). Émile-Joseph Vivien was born on 18th September, 1878 in Elbeuf-sur-Seine, Seine-Maritime. Henri Gustave Thiébaud was born on 18th September, 1906 in Saint-Imier. Stefan Kudoke was born on 18th September, 1978 in Frankfurt (Oder).
Marie-Magdeleine Hurel died on 18th September, 1791 in Saint-Nicolas d'Aliermont. Michel-Cyprien Cailly died on 18th September, 1811 in Saint-Nicolas d'Aliermont. Jacques Edouard Chevrolet died on 18th September, 1901 in Bonfol. Daniel Auguste Mottu died on 18th September, 1903 in Avully near Geneva. Marie-Théotime Legrand died on 18th September, 1904 in Saint-Nicolas d'Aliermont. David Perret died on 18th September, 1908.