1643 in science
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The year 1643 in science and technology
See also: 1642 in science, other events of 1643, 1644 in science, list of years in science.
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Exploration
- January 21 - Abel Tasman discovers the Tonga archipelago.
Meteorology
- Evangelista Torricelli invents the mercury barometer.
Births
- January 4 - Isaac Newton (+1727), physicist and mathematician