Portal:History of science/Selected anniversaries/February 9
- 1752 - Death of Fredric Hasselquist, Swedish naturalist (b. 1722)
- 1775 - Birth of Farkas Bolyai, Hungarian mathematician (d. 1856)
- 1781 - Birth of Johann Baptist von Spix, German scientist (d. 1826)
- 1789 - Birth of Franz Xaver Gabelsberger, German inventor of the stenography (d. 1849)
- 1865 - Birth of Erich von Drygalski, German geographer, geophysicist, and polar scientist (d. 1949)
- 1870 - The U.S. Weather Bureau was established
- 1880 - Birth of Lipót Fejér, Hungarian mathematician (d. 1959)
- 1910 - Birth of Jacques Monod, French biochemist, Nobel laureate (d. 1976)
- 1925 - Birth of Burkhard Heim, German physicist (d. 2001
- 1954 - Birth of Kevin Warwick, Cyborg Scientist
- 1963 - Birth of Brian Greene, American physicist
- 1979 - Death of Dennis Gabor, Hungarian physicist, Nobel laureate (b. 1900)
- 1986 - Comet Halley reaches perihelion, its closest approach to the Sun, during its second visit to the inner Solar System in the 20th century
- 1994 - Death of Howard Martin Temin, American geneticist, Nobel laureate (b. 1934)