List of years in science (Table)
… 1630 • 1631 • 1632 • 1633 • 1634 • 1635 • 1636 •    1637 • 1638 • 1639 – 1640 – 1641 • 1642 • 1643 •    1644 • 1645 • 1646 • 1647 • 1648 • 1649 • 1650 …
Related time period or subjects
… 1637 • 1638 • 1639 – 1640 – 1641 • 1642 • 1643 … … 1610s • 1620s • 1630s – 1640s – 1650s • 1660s • 1670s … … 16th century – 17th century – 18th century …
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The year 1640 in science and technology involved some significant events.

Technology

• The micrometer is developed.
• A form of bayonet is invented, and in later years, it will gradually replace the pike.
• The reticle telescope is developed and initiates the birth of sharpshooting.

Mathematics

• Blaise Pascal discovers, at the age of 16, the properties of the hexagrammum mysticum.
• Fermat discovers that an odd prime p can be written as the sum of two squares.

Computer science

• Blaise Pascal’s machine is developed: it will often be cited as the first calculator.

Exploration

• The Cape Verde Island of Sal is discovered, originally named "Llana" (meaning "flat").

Births

• April 1 - Georg Mohr, Danish mathematician (died 1697)

Deaths