1609 in science
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The year 1609 in science and technology involved some significant events.
Astronomy
- July 26 – English scientist Thomas Harriot becomes the first to draw an astronomical object after viewing it through a telescope: he draws a map of the Moon, preceding Galileo by several months.{{cite web|url=http://news.bbc.co.uk/1/hi/sci/tech/7827732.stm|first=Christine|last=McGourty|title='English Galileo' maps on display|publisher=BBC News|date=2009-01-14|accessdate=2012-07-04}}{{cite web|url=http://galileo.rice.edu/sci/harriot_moon.html|work=The Galileo Project|title=Thomas Harriot's Moon Drawings|year=1995|accessdate=2012-07-04}}
- Johannes Kepler publishes Astronomia nova, containing his first two laws of planetary motion.
Biology
- Charles Butler publishes The Feminine Monarchie, or, A Treatise Concerning Bees.
Exploration
- April 4 – Henry Hudson sets out from Amsterdam in the Halve Maen.{{cite book|last=Hunter|first=Douglas|year=2009|title=Half Moon: Henry Hudson and the voyage that redrew the map of the New World|location=London|publisher=Bloomsbury Press|isbn=1-59691-680-X|page=[https://archive.org/details/halfmoonhenryhud00hunt/page/11 11]|url=https://archive.org/details/halfmoonhenryhud00hunt/page/11}}
- August 28 – Hudson finds Delaware Bay.
- September 11–12 – Hudson sails into Upper New York Bay{{cite web|url=http://blog.insidetheapple.net/2008/09/new-yorks-many-911-anniversaries-staten.html|last=Nevius|first=Michelle|author2=James|title=New York's many 9/11 anniversaries: the Staten Island Peace Conference|work=Inside the Apple: A Streetwise History of New York City|date=2008-09-08|accessdate=2011-10-25}} and begins a journey up the Hudson River.{{cite book|last=Juet|first=Robert|chapter=Juet's Journal of Hudson's 1609 Voyage|year=1625|title=Hakluytus Posthumus, or Purchas his Pilgrimes|volume=4|editor=Purchas, Samuel|editor-link=Samuel Purchas}}
Medicine
- Louise Bourgeois Boursier publishes Diverse Observations on Sterility; Loss of the Ovum after Fecundation, Fecundity and Childbirth; Diseases of Women and of Newborn Infants in Paris, the first book on obstetrics written by a woman.{{cite book|last=Anzovin|first=Steven|title=Famous First Facts|year=2000|publisher=H. W. Wilson Co|isbn=0-8242-0958-3|url=https://archive.org/details/famousfirstfacts00anzo}}
- Jacques Guillemeau publishes De l'heureux accouchement des femmes in which he describes a method of assisted breech delivery.
Technology
- Cornelius Drebbel invents the thermostat.
Births
- June 29 – Pierre Paul Riquet, French engineer and canal builder (died 1680)
- October 8 – John Clarke, English physician (died 1676)
Deaths
- March 26 – John Dee, English alchemist, astrologer and mathematician (born 1527){{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}}
- April 4 – Carolus Clusius, Flemish botanist (born 1525)
- August 4 – Joseph Duchesne, French physician and alchemist (born c.1544).{{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}}
- August 16 – André du Laurens, French physician and gerontologist (born 1558).{{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}}
- December – Oswald Croll, German iatrochemist (born c. 1563)