1644 in science

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 1735.

Technology

 * Jacob van Eyck collaborates with the bellfounding duo Pieter and François Hemony to create the first tuned carillon in Zutphen.

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 1580)