Editing 1609 in science (section)

==Deaths==
* March 26 – [[John Dee (mathematician)|John Dee]], [[English people|English]] [[Alchemy|alchemist]], [[astrologer]] and [[mathematician]] (born [[1527 in science|1527]])<ref>{{cite web|first=R. Julian|last=Roberts|title=Dee, John (1527–1609)|work=[[Oxford Dictionary of National Biography]]|publisher=Oxford University Press|year=2004|url=http://www.oxforddnb.com/view/article/7418|accessdate=2011-04-18|doi=10.1093/ref:odnb/7418}} {{ODNBsub}}</ref>
* April 4 – [[Carolus Clusius]], [[Flanders|Flemish]] [[botanist]] (born [[1525 in science|1525]])
* August 4 – [[Joseph Duchesne]], [[French people|French]] physician and alchemist (born c.[[1544 in science|1544]]).<ref>{{cite web |title=Joseph Du Chesne (Sieur de la Violette, 1544-1609) |url=https://data.bnf.fr/fr/12396854/joseph_du_chesne/ |website=data.bnf.fr |publisher=Bibliothèque nationale de France |access-date=23 December 2020}}</ref>
* August 16 – [[André du Laurens]], French physician and [[gerontologist]] (born [[1558 in science|1558]]).<ref name="Bayle1711">{{cite book|author=Pierre Bayle|title=Dictionnaire historique et critique|url=https://books.google.com/books?id=4FpDAAAAcAAJ&pg=PA69|year=1711|publisher=P. Brunel|pages=69}}</ref>
* December – [[Oswald Croll]], [[German people|German]] [[Iatrochemistry|iatrochemist]] (born c. [[1563 in science|1563]])