1642 in science,
other events of 1643,
1644 in science,
list of years in science.
January 21 - Abel Tasman discovers the Tonga archipelago.
Evangelista Torricelli invents the mercury barometer.
January 4 - Isaac Newton (+1727), physicist and mathematician
November 3 - John Bainbridge, astronomer
November 3 - Paul Guldin, mathematician and astronomer