Portal:History of science/Selected anniversaries/October 9
- 1562 – Death of Gabriele Falloppio, Italian anatomist and early advocate for the use of condoms. (b. 1523)
- 1581 – Birth of Claude Gaspard Bachet de Méziriac, French mathematician (d. 1638)
- 1604 - Supernova 1604, the most recent supernova to be observed in the Milky Way
- 1704 – Birth of Ján Andrej Segner, Slovak and German mathematician, physicist, and physician (d. 1777)
- 1806 – Death of Benjamin Banneker, American astronomer (b. 1731)
- 1852 – Birth of Hermann Emil Fischer, German chemist, Nobel Prize laureate (d. 1919)
- 1879 – Birth of Max von Laue, German physicist, Nobel Prize laureate (d. 1960)
- 1933 – Birth of Peter Mansfield, British physicist, Nobel Prize in Physiology or Medicine laureate
- 1936 - Generators at Boulder Dam (later renamed to Hoover Dam) begin to generate electricity from the Colorado River and transmit it 266 miles (428 km) to Los Angeles, California
- 1943 – Birth of Douglas Kirby, Research scientist
- 1943 – Death of Pieter Zeeman, Dutch physicist, Nobel Prize laureate (b. 1865)
- 1967 – Death of Cyril Norman Hinshelwood, English chemist, Nobel Prize laureate (b. 1897)
- 1992 - A 13 kilogram (est.) fragment of the Peekskill meteorite lands in the driveway of the Knapp residence in Peekskill, New York, destroying the family's 1980 Chevrolet Malibu