1644 in science

List of years in science (table)
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The year 1644 AD in science and technology involved some significant events.

Mathematics

• The Basel problem is posed by Pietro Mengoli, and will puzzle mathematicians until solved by Leonhard Euler in 1731.

Publications

• Jan Baptist van Helmont publishes Dageraad ofte Nieuwe Opkomst der Geneeskunst ("Daybreak, or the New Rise of Medicine").

Births

• 25 September – Ole Rømer, Danish astronomer who makes the first quantitative measurements of the speed of light (died 1710)

Deaths

• 2 July – William Gascoigne, English scientist (born 1610)
• 30 December – Jan Baptist van Helmont, Flemish chemist (born 1579)