1620 in science

The year 1620 in science and technology involved some significant events.

Astronomy

 * The work of Copernicus (died 1543) is edited and released, as directed by the Congregation of the Index (reading forbidden in March 1616): nine sentences, which state the heliocentric system as certain, are either omitted or changed.

Cartography

 * The atlas Atlante geografico d'Italia, compiled by Giovanni Antonio Magini, is published posthumously.

Chemistry

 * The scientific method of reasoning is expounded by Francis Bacon in his Novum Organum.

Earth sciences

 * Francis Bacon notices the jigsaw fit of the opposite shores of the Atlantic Ocean.

Medicine

 * Nicholas Habicot, surgeon to the Duke of Nemours, publishes a report of four successful "bronchotomies" which he has performed; these include the first recorded case of a tracheotomy for the removal of a thrombus and the first pediatric tracheotomy, to extract a foreign body from a 14-year-old's esophagus.

Technology

 * May 17 – The first carousel is seen at a fair (Philippapolis, Turkey).
 * Cornelis Drebbel builds the first navigable submarine, in England.

Births

 * April? – William Brouncker, Anglo-Irish mathematician (died 1684)
 * July 21 – Jean Picard, French astronomer (died 1682)
 * September 25 – François Bernier, French physician and traveller (died 1688)
 * December 23 - Johann Jakob Wepfer, Swiss pathologist and pharmacologist (died 1695)
 * Ralph Bathurst, English theologian, physician and academic (died 1704)
 * Bernard de Gomme, Dutch-born military engineer (died 1685)
 * Edme Mariotte, French physicist and priest (died 1684)
 * Robert Morison, Scottish botanist and taxonomist (died 1683)

Deaths

 * Simon Stevin, Flemish scientist (born c. 1548)