* 1629 – Christiaan Huygens, Dutch mathematician ( d. 1695 )

In 1691 Gottfried Leibniz, Christiaan Huygens, and Johann Bernoulli derived the equation in response to a challenge by Jakob Bernoulli.

The mathematical description was derived in 1659 by Dutch physicist Christiaan Huygens.

Augustin-Jean Fresnel did more definitive studies and calculations of diffraction, made public in 1815 and 1818, and thereby gave great support to the wave theory of light that had been advanced by Christiaan Huygens and reinvigorated by Young, against Newton's particle theory.

It was notable for containing the principles of the stereographic and the orthographic projections, and it inspired the works of Desargues and Christiaan Huygens.

* Christiaan Huygens 1629 – 1695 ( Netherlands )

Christiaan Huygens experimented with gunpowder in 1673 in an early attempt to build an internal combustion engine, but he did not succeed.

The Huygens – Fresnel principle ( named after Dutch physicist Christiaan Huygens and French physicist Augustin-Jean Fresnel ) is a method of analysis applied to problems of wave propagation both in the far-field limit and in near-field diffraction.

* Christiaan Huygens

Christiaan Huygens, prior to Newton, had hypothesized that light was a wave propagating through an aether, but Newton rejected this idea.

In 1668, Wilkins proposed using Christopher Wren's suggestion of a pendulum with a half-period of one second to measure a standard length that Christiaan Huygens had observed to be 38 Rhineland or English inches ( 997mm ) in length.

* 1655 – Saturn's largest moon, Titan, is discovered by Christiaan Huygens.

There has been some debate about who the original inventor of the magic lantern is, but the most widely accepted theory is that Christiaan Huygens developed the original device in the late 1650s.

This phenomenon was first observed by Christiaan Huygens in 1665.

Christiaan Huygens published the first book on probability

Christiaan Huygens ( 1657 ) gave the earliest known scientific treatment of the subject.

File: Christiaan Huygens-painting. jpeg | Christiaan Huygens ( 1629-1695 ): studied the rings of Saturn and discovered its moon Titan, invented the pendulum clock, studied optics and centrifugal force, theorized that light consists of waves ( Huygens – Fresnel principle ) which became instrumental in the understanding of wave-particle duality.

Christiaan Huygens published a book on the subject in 1657 and in the 19th century a big work was done by Laplace in what can be considered today as the classic interpretation.

From its invention in 1656 by Christiaan Huygens until the 1930s, the pendulum clock was the world's most precise timekeeper, accounting for its widespread use.

The pendulum clock was invented in 1656 by Dutch scientist Christiaan Huygens, and patented the following year.

Optics, for instance, was revolutionized by people like Robert Hooke, Christiaan Huygens, René Descartes and, once again, Isaac Newton, who developed mathematical theories of light as either waves ( Huygens ) or particles ( Newton ).

* Christiaan Huygens writes the first book to be published on probability theory, De ratiociniis in ludo aleae (" On Reasoning in Games of Chance ").

In 1673, Christiaan Huygens published his theory of the pendulum, Horologium Oscillatorium sive de motu pendulorum.

Christiaan Huygens solved this problem in the 1650s and published it much later as a book.

The nebula was independently discovered by several other prominent astronomers in the following years, including, in 1656, Christiaan Huygens ( whose sketch was the first published, in 1659 ).

The first tables for the equation of time which accounted for its annual variations in an essentially correct way were published in 1665 by Christiaan Huygens.

* Christiaan Huygens writes the first book to be published on probability theory, De ratiociniis in ludo aleae (" On Reasoning in Games of Chance ").

In 1673, 17 years after he invented the pendulum clock, Christiaan Huygens published his mathematical analysis of pendulums, Horologium Oscillatorium.

Augustin-Jean Fresnel did more definitive studies and calculations of diffraction, published in 1815 and 1818, and thereby gave great support to the wave theory of light that had been advanced by Christiaan Huygens and reinvigorated by Young, against Newton's particle theory.

" He wrote two books on the subject, one published in 1647 and the other in 1668, which cover some two or three thousand closely printed pages ; the fallacy in the quadrature was pointed out by Christiaan Huygens.

Drawing of one of his first balance springs, attached to a balance wheel, by Christiaan Huygens, inventor of the balance spring, published in his letter in the Journal des Sçavants of 25 February 1675.

At the time, such speculation was of a rather rarefied sort, and was limited to astronomers like Christiaan Huygens who wrote a book, Cosmotheoros ( 1698 ) considering the possibility of life on other planets ; or to philosophers like Campanella, who wrote in defense of Galileo.

The other Holland Land Company investors included: the merchants Pieter and Christiaan van Eeghen ; Rutger Jan Schimmelpenninck, a lawyer and politician ; Pieter Stadnitski ; the brothers and bankers Jan, Roelof & Nicolaas van Staphorst ; Hendrick Vollenhoven ; Cornelius Vollenhoven ; Hendrick Seye ; Wilhelm Willink ( the younger ); Jan Willink ; and Jan Willink ( the younger ).

In recognition of these and other achievements he was knighted in 1971 further confirming a national prominence comparable to that achieved by René Favaloro in Argentina and Christiaan Barnard in South Africa.

It is striking, that Christiaan senior imparted the ' modern ' system of 7 note names to the boys, instead of the traditional, but much more complicated hexachord system.

Christiaan Huygens, another Dutchman, developed a simple 2-lens ocular system in the late 17th century that was achromatically corrected, and therefore a huge step forward in microscope development.

He challenged Christiaan Huygens to solve the following system of equations in integers,

In his 1678 Traité de la Lumiere, Christiaan Huygens showed how Snell's law of sines could be explained by, or derived from, the wave nature of light, using what we have come to call the Huygens – Fresnel principle.

In 1611, Johannes Kepler described how a telescope could be made with a convex objective lens and a convex eyepiece lens and by 1655 astronomers such as Christiaan Huygens were building powerful but unwieldy Keplerian telescopes with compound eyepieces.

Among its first settlers were Christiaan Hendriksen ( who could be considered as a founder of New York City ) and Jan Rodrigues the first black man to live in the city.

Christiaan Huygens believed in the existence of extraterrestrial life.