1609 in science

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

Astronomy

April 4 - Henry Hudson's sets out from Amsterdam in the Halve Maen.^[1]
- August 28 - Hudson finds Delaware Bay.
- September 11–12 - Hudson sails into Upper New York Bay^[2] and begins a journey up the Hudson River.^[3]

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.^[4]
Jacques Guillemeau publishes De l'heureux accouchement des femmes in which he describes a method of assisted breech delivery.

^ Hunter, Douglas (2009). Half Moon: Henry Hudson and the voyage that redrew the map of the New World. London: Bloomsbury Press. p. 11. ISBN 1-59691-680-X.
^ Nevius, Michelle; James (2008-09-08). "New York's many 9/11 anniversaries: the Staten Island Peace Conference". Inside the Apple: A Streetwise History of New York City. http://blog.insidetheapple.net/2008/09/new-yorks-many-911-anniversaries-staten.html. Retrieved 2011-10-25.
^ Juet, Robert (1609). "Juet's Journal of Hudson's 1609 Voyage from the 1625 edition of Purchas His Pilgrimes and transcribed 2006 by Brea Barthel" (PDF). http://www.halfmoon.mus.ny.us/Juets-modified.pdf. Retrieved 2009-10-22.
^ Anzovin, Steven (2000). Famous First Facts. H. W. Wilson Co. ISBN 0-8242-0958-3.
^ Roberts, R. Julian (2004). "Dee, John (1527–1609)". Oxford Dictionary of National Biography. Oxford University Press. doi:10.1093/ref:odnb/7418. http://www.oxforddnb.com/view/article/7418. Retrieved 2011-04-18. Subscription or UK public library membership required