1644 in science
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The year 1644 AD in science and technology involved several significant events in mathematics, technology, and medicine.
Mathematics
- The Basel problem is posed by Pietro Mengoli, and will puzzle mathematicians until solved by Leonhard Euler in 1735.{{cite book|last1=Sandifer|first1=C. Edward|title=How Euler Did It|date=2007|publisher=MAA|isbn=9780883855638|page=205|url=https://books.google.com/books?id=sohHs7ExOsYC&pg=PA205|language=en}}
Technology
- Jacob van Eyck collaborates with the bellfounding duo Pieter and François Hemony to create the first tuned carillon in Zutphen.{{cite book|last=Lehr|first=André|title=The Art of the Carillon in the Low Countries|location=Tielt, Belgium|publisher=Lannoo|year=1991|isbn=90-209-1917-2}}
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){{cite web|title=Ole Rømer - Danish astronomer|url=https://www.britannica.com/biography/Ole-Romer|website=Encyclopedia Britannica|accessdate=3 April 2018|language=en}}
Deaths
- 2 July – William Gascoigne, English scientist (born 1610){{cite book|last1=Vaquero|first1=J. M.|last2=Vázquez|first2=M.|title=The Sun Recorded Through History|date=2009|publisher=Springer Science & Business Media|isbn=9780387927909|page=236|url=https://books.google.com/books?id=iWkyiEeiyksC&pg=PA236|language=en}}
- 30 December – Jan Baptist van Helmont, Flemish chemist (born 1580){{cite web|title=Jan Baptista van Helmont - Belgian scientist|url=https://www.britannica.com/biography/Jan-Baptista-van-Helmont|website=Encyclopedia Britannica|accessdate=3 April 2018|language=en}}