1644 in science
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- The Basel problem is posed by Pietro Mengoli, and will puzzle mathematicians until solved by Leonhard Euler in 1735.
- Jan Baptist van Helmont publishes Dageraad ofte Nieuwe Opkomst der Geneeskunst ("Daybreak, or the New Rise of Medicine").
- 25 September – Ole Rømer, Danish astronomer who makes the first quantitative measurements of the speed of light (died 1710)
- 2 July – William Gascoigne, English scientist (born 1610)
- 30 December – Jan Baptist van Helmont, Flemish chemist (born 1580)
- Sandifer, C. Edward (2007). How Euler Did It. MAA. p. 205. ISBN 9780883855638.
- "Ole Rømer - Danish astronomer". Encyclopedia Britannica. Retrieved 3 April 2018.
- Vaquero, J. M.; Vázquez, M. (2009). The Sun Recorded Through History. Springer Science & Business Media. p. 236. ISBN 9780387927909.
- "Jan Baptista van Helmont - Belgian scientist". Encyclopedia Britannica. Retrieved 3 April 2018.