1643 in science

The year 1643 in science and technology involved some significant events.

Exploration

 * January 21 – Abel Tasman discovers the Tonga archipelago.
 * December 25 – Captain William Mynors of the British East India Company discovers Christmas Island.

Meteorology

 * Evangelista Torricelli invents the mercury barometer.

Births

 * January 4 (NS) – Isaac Newton, English physicist (died 1727)
 * Jean de Fontaney, French Jesuit mathematician and astronomer (died 1710)
 * Pierre Dionis, French surgeon and anatomist (died 1718)

Deaths

 * April 9 – Benedetto Castelli, Italian mathematician (born 1578)
 * November 3
 * John Bainbridge, English astronomer (born 1582)
 * Paul Guldin, Swiss mathematician and astronomer (born 1577)
 * Sophia Brahe, Danish astronomer (born 1556)
 * Gasparo Berti, Italian mathematician, astronomer and physicist (born c. 1600)
 * Walter Warner, English scientist (born 1563)