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1639 in science
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The year 1639 in science and technology involved some significant events.

Astronomy
- Giovanni Battista Zupi observes that the planet Mercury has orbital phases.
- December 4 (November 24 in Julian calendar) – English astronomers Jeremiah Horrocks and William Crabtree are the first and only scientific observers of a transit of Venus, predicted by Horrocks.
Exploration
- The Casiquiare canal, a river forming a natural canal between the Amazon River and Orinoco River basins, is first encountered by Europeans
Mathematics
- Girard Desargues introduces the concept of infinity into geometry.
Births
Deaths
References
References
- Crilly, Tony. (2007). "50 Mathematical Ideas you really need to know". Quercus.
- Marr, Alexander. (2011). "Between Raphael and Galileo: Mutio Oddi and the Mathematical Culture of Late Renaissance Italy". University of Chicago Press.
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