Portal:History of science/Selected anniversaries/January 7
- 1610 - Galileo Galilei observes the four largest moons of Jupiter for the first time. He named them and in turn the four are called the Galilean moons
- 1834 - Birth of Johann Philipp Reis, German physicist and inventor (d. 1874)
- 1871 - Birth of Émile Borel, French mathematician and politician (d. 1956)
- 1878 - Death of François-Vincent Raspail, French chemist (b. 1794)
- 1893 - Death of Jožef Stefan, Slovenian physicist and mathematician (b. 1835)
- 1894 - W. K. Dickson receives a patent for motion picture film
- 1925 - Birth of Gerald Durrell, British naturalist (d. 1995)
- 1927 - First transatlantic telephone call – New York City to London
- 1941 - Birth of John E. Walker, English chemist, Nobel Prize laureate
- 1954 - Georgetown–IBM experiment, the first public demonstration of a machine translation system, is held in New York at the head office of IBM
- 1998 - Death of Vladimir Prelog, Croatian chemist, Nobel Prize laureate (b. 1906)