1609 in science
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The year 1609 in science and technology involved some significant events.

Astronomy
- July 26 â 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.[1][2]
- Johannes Kepler publishes Astronomia nova, containing his first two laws of planetary motion.
Biology
- Charles Butler publishes The Feminine Monarchie, or the History of Bees, the first full-length English-language treatise on the science of beekeeping.
Exploration
- April 4 â Henry Hudson sets out from Amsterdam in the Halve Maen.[3]
- August 28 â Hudson finds Delaware Bay.
- September 11â12 â Hudson sails into Upper New York Bay[4] and begins a journey up the Hudson River.[5]
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.[6]
- 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 â Pierre Paul Riquet, French engineer and canal builder (died 1680)
- October 8 â John Clarke, English physician (died 1676)
Deaths
- March 26 â John Dee, English alchemist, astrologer and mathematician (born 1527)[7]
- April 4 â Carolus Clusius, Flemish botanist (born 1525)
- August 4 â Joseph Duchesne, French physician and alchemist (born c.1544).[8]
- August 16 â André du Laurens, French physician and gerontologist (born 1558).[9]
- December â Oswald Croll, German iatrochemist (born c. 1563)