1609 in science

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

Title Page of Kepler's Astronomia nova

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.<ref>{{#invoke:citation/CS1|citation

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• 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.<ref>Template:Cite book</ref>
  • August 28 – Hudson finds Delaware Bay.
  • September 11–12 – Hudson sails into Upper New York Bay<ref>{{#invoke:citation/CS1|citation

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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.<ref>Template:Cite book</ref>
• 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)<ref>{{#invoke:citation/CS1|citation

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• April 4 – Carolus Clusius, Flemish botanist (born 1525)
• August 4 – Joseph Duchesne, French physician and alchemist (born c.1544).<ref>{{#invoke:citation/CS1|citation

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• August 16 – André du Laurens, French physician and gerontologist (born 1558).<ref name="Bayle1711">Template:Cite book</ref>
• December – Oswald Croll, German iatrochemist (born c. 1563)