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Christiaan Huygens

Dutch mathematician, physicist and astronomer (1629–1695)

8 dated entries naming Christiaan Huygens, drawn from 8 separate years between 1655 CE and 1690 CE. Nothing here is written by us: each line is the sentence a Wikipedia year article used, and the link beside it opens the exact revision.

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17th century

  • 1655March 25 – Saturn's largest moon, Titan, is discovered by Christiaan Huygens.source
  • 1656December 25 – The pendulum clock is invented by Christiaan Huygens, so accurate that it only loses 10 seconds per day. Huygens will mention the date in a letter to Ismail Boulliau a year later.source
  • 1657Christiaan Huygens writes the first book to be published on probability theory, De ratiociniis in ludo aleae ("On Reasoning in Games of Chance").source
  • 1659July – Christiaan Huygens's important work on astronomy, Systema Saturnium, is published.source
  • 1671October 25 – Italian-born French astronomer Giovanni Domenico Cassini discovers Iapetus, the second known moon of the planet Saturn. Christiaan Huygens had discovered the Saturnian moon Titan on March 25, 1655.source
  • 1672December 23 – French astronomer Giovanni Domenico Cassini discovers Rhea, a previously-unknown satellite of the planet Saturn. Rhea is the second-largest overall, and the third moon of Saturn to be discovered by Earth astronomers, Titan having been found by Christiaan Huygens on March 25, 1655 and Iapetus by Cassini on October 25, 1671.source
  • 1675February 25 – Netherlands scientist Christiaan Huygens files drawings of his invention of the balance spring, the key component to the accuracy of portable clocks and pocket watches, in a letter to the Journal des Sçavants.source
  • 1690Dutch polymath Christiaan Huygens publishes his book Treatise on Light. The book is considered a pioneering work of theoretical and mathematical physics.source

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