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.
Johannes Kepler publishes Astronomia nova, containing his first two laws of planetary motion.
Charles Butler publishes The Feminine Monarchie, or, A Treatise Concerning Bees.
April 4 – Henry Hudson sets out from Amsterdam in the Halve Maen.August 28 – Hudson finds Delaware Bay.
September 11–12 – Hudson sails into Upper New York Bay and begins a journey up the Hudson River.
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.
Jacques Guillemeau publishes De l'heureux accouchement des femmes in which he describes a method of assisted breech delivery.
Cornelius Drebbel invents the thermostat.
June 29 – Pierre Paul Riquet, French engineer and canal builder (died 1680)
October 8 – John Clarke, English physician (died 1676)
March 26 – John Dee, English alchemist, astrologer and mathematician (born 1527)
April 4 – Carolus Clusius, Flemish botanist (born 1525)
August 4 - Joseph Duchesne, French physician and alchemist (born c.1544)
December – Oswald Croll, German iatrochemist (born c. 1563)
André du Laurens, French physician and gerontologist (born 1558)
1609 in science Wikipedia
The year 1609 in science and technology involved some significant events.