1639 in science

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

Jeremah Horrock's observation of Venus transit across the Sun in 1639. From his work Venus in sole visa, printed 1662

Astronomy

• Giovanni Battista Zupi observes that the planet Mercury has orbital phases.
• December 4 (November 24 in Julian calendar) - Jeremiah Horrocks, an English astronomer, observes the transit of Venus.

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

• December 18 - Gottfried Kirch, German astronomer (d. 1710)
• approx. date - Daniel Greysolon, Sieur du Lhut, French explorer (d. 1710)

Deaths

• June 6 - Peter Crüger, German polymath (b. 1580)
• August 7 - Martin van den Hove, Dutch astronomer (b. 1605)