1620 in science
# 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)
