Portal:History of science/Selected anniversaries/August 9
- 1726 - Birth of Francesco Cetti, Italian Jesuit scientist (d. 1778)
- 1776 - Birth of Amedeo Avogadro, Italian chemist (d. 1856)
- 1892 - Thomas Edison receives a patent for a two-way telegraph
- 1896 - Birth of Erich Hückel, German physicist (d. 1980)
- 1911 - Birth of William Alfred Fowler, American physicist, Nobel Prize Laureate (d. 1996)
- 1969 - Death of Cecil Frank Powell, British physicist, Nobel Prize Laureate (b. 1903)
- 2006 - Death of James van Allen, American physicist (b. 1914)