1619 in science

The year 1619 in science and technology involved some significant events.

Astronomy

 * Publication of Johannes Kepler's third law of planetary motion in his Harmonices Mundi. He also recognises the duality of convex polyhedra.
 * Publication of the Jesuit Giuseppe Biancani's Sphaera mundi, seu cosmographia demonstrativa, ac facili methodo tradita in Bologna.

Biochemistry

 * Lactose is discovered by Fabriccio Bartoletti; the word lactose comes from the Latin word lac which means "milk".

Exploration

 * In North America, the Churchill River is discovered by Danish explorer Jens Munk, and it will be used for over 100 years as a trading route of the Hudson's Bay Company from their fort at its mouth to the interior.
 * Frederick de Houtman and Jans van Edel discover the Houtman Abrolhos islands.

Medicine

 * Dermod O'Meara's text on genetic disorders, De Moribus: Pathologia Haereditaria Generalis is published in Dublin, the first medical text published in Ireland.

Metallurgy

 * Sir Basil Brooke produces steel using a reverbatory furnace in Coalbrookdale, England.

Births

 * probable date – Daniel Whistler, English physician (died 1684)

Deaths

 * May 21 – Hieronymus Fabricius, Italian anatomist and embryologist (born 1537)
 * September – Hans Lippershey, Dutch lensmaker, credited with inventing the telescope in 1608 (born c. 1570)
 * Olivier de Serres, French soil scientist (born 1539)
 * Caterina Vitale, Maltese chemist (born 1566)