# 1640 in science

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The year **1640 in science** and technology involved some significant events.

## Botany[edit]

- John Parkinson publishes
*Theatrum Botanicum:The Theater of Plants, or, An Herbal of a Large Extent*.^{[1]}

## Exploration[edit]

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

## Mathematics[edit]

- The 16-year-old Blaise Pascal demonstrates the properties of the
*hexagrammum mysticum*in his*Essai pour les coniques*which he sends to Mersenne. - October 18 – Fermat states his "little theorem" in a letter to Frénicle de Bessy: if
*p*is a prime number, then for any integer*a*,*a*^{ p}−*a*will be divisible by*p*. - December 25 – Fermat claims a proof of the theorem on sums of two squares in a letter to Mersenne ("Fermat's Christmas Theorem"): an odd prime
*p*is expressible as the sum of two squares.

## Technology[edit]

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

## Births[edit]

- April 1 – Georg Mohr, Danish mathematician (died 1697)
- December 13 (
*bapt.*) – Robert Plot, English naturalist and chemist (died 1696) - Elias Tillandz, Swedish physician and botanist in Finland (died 1693)

## Deaths[edit]

- December 22 – Jean de Beaugrand, French mathematician (born c. 1584)

## References[edit]

**^**Tran, Linh. "Theatrum Botanicum: The Theater of Plants, or, An Herbal of a Large Extent". Texas A&M University Bioinformatics Working Group. Archived from the original on November 5, 2008. Retrieved 2011-04-01.