1643 in science

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.

  Technology

• A microscope is developed by Antonie van Leeuwenhoek of Delft.

  Births

• January 4 – Isaac Newton, English physicist
• Jean de Fontaney, French Jesuit mathematician and astronomer

  Deaths

• April 9 – Benedetto Castelli, Italian mathematician
• November 3
• * John Bainbridge, English astronomer
• * Paul Guldin, Swiss mathematician and astronomer
• Sophia Brahe, Danish astronomer
• Gasparo Berti, Italian mathematician, astronomer and physicist
• Walter Warner, English scientist