* 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

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 ).

This cosmology was accepted by Isaac Newton, Christiaan Huygens and later scientists.

The idea of duality originated in a debate over the nature of light and matter that dates back to the 17th century, when competing theories of light were proposed by Christiaan Huygens and Isaac Newton: light was thought either to consist of waves ( Huygens ) or of particles ( Newton ).

For their ideas on derivatives, both Newton and Leibniz built on significant earlier work by mathematicians such as Isaac Barrow ( 1630 – 1677 ), René Descartes ( 1596 – 1650 ), Christiaan Huygens ( 1629 – 1695 ), Blaise Pascal ( 1623 – 1662 ) and John Wallis ( 1616 – 1703 ).

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Historically, the phenomena of this crystal were studied at length by Christiaan Huygens and Isaac Newton.

Christiaan Huygens, in a letter dated June 8, 1694, wrote to Leibniz, " I do not know if you are acquainted with the accident which has happened to the good Mr Newton, namely, that he has had an attack of phrenitis, which lasted eighteen months, and of which they say his friends have cured him by means of remedies, and keeping him shut up.

As a distinct field, experimental physics was established in early modern Europe, during what is known as the Scientific Revolution, by physicists such as Galileo Galilei, Christiaan Huygens, Johannes Kepler, Blaise Pascal and Sir Isaac Newton.

Picard collaborated and corresponded with many scientists, including Isaac Newton, Christiaan Huygens, Ole Rømer, Rasmus Bartholin, Johann Hudde, and even his main competitor, Giovanni Cassini, although Cassini was often less than willing to return the gesture.

It was first introduced by Claude Perrault in 1670, and later studied by Sir Isaac Newton ( 1676 ) and Christiaan Huygens ( 1692 ).

Newton most likely rejected astrology, however ( as did his contemporary Christiaan Huygens ), and interest in astrology declined after his era, helped by the increasing popularity of a Cartesian, " mechanistic " cosmology in the Enlightenment.

Hudde corresponded with Baruch Spinoza and Christiaan Huygens, Johann Bernoulli, Isaac Newton and Leibniz.

* Isaac Newton, Galileo, Descartes, Robert Hooke and Christiaan Huygens

Christiaan Huygens was born in April 1629 at The Hague, the second son of Constantijn Huygens, ( 1596 – 1687 ), friend of mathematician, philosopher and minor physicist René Descartes, and of Suzanna van Baerle ( deceased 1637 ), whom Constantijn had married on 6 April 1627.

The couple had five children: in 1628 their first son, Constantijn Jr., in 1629 Christiaan, in 1631 Lodewijk and in 1633 Philips.

In 1673 Dutch scientist Christiaan Huygens in his mathematical analysis of pendulums, Horologium Oscillatorium, showed that a real pendulum had the same period as a simple pendulum with a length equal to the distance between the pivot point and a point called the center of oscillation, which is located under the pendulum's center of gravity and depends on the mass distribution along the length of the pendulum.

During the 1960s she also had an affair with heart transplant pioneer Christiaan Barnard.

According to French astronomer Camille Guillaume Bigourdan ( 1851-1932 ), the French astronomers Adrien Auzout ( 1622-1691 ) and Jacques Buot ( or Buhot ) (< 1623-1678 ), the Dutch physicist Christiaan Huygens ( 1629-1695 ), the Czech physician / astronomer Hagecius ( 1525-1600 ) had all suggested the method ; even the ancient Greek astronomer Hipparchus ( 190 B. C. E .- 120 B. C. E.

Beyers Naudé was named for General Christiaan Frederick Beyers, under whom his father had served as a soldier and unofficial pastor during the second Anglo-Boer War.

She allegedly had an affair with Dr Christiaan Barnard, the South African heart surgeon.

He was first seen by Dr. Barry Kaplan, who in July 1966 had asked if Mr Christiaan Barnard would be willing to attend Washkansky.

For forty years, Barnard's brother Marius kept a secret: that rather than wait for her heart to stop beating, at Marius ’ s urging, Christiaan had injected potassium into Denise ’ s heart to paralyze it and thus, to render her technically dead by the whole-body standard.

His father, Christiaan Willem Hendrik van der Post ( 1856 – 1914 ), of Dutch origin, had arrived in South Africa at the age of three and had married van der Post's mother in 1889.

When the South African government had offered to invade the German colonies, the commander-in-chief of the Union Defense Force General Christiaan Beyers resigned, writing " It is sad that the war is being waged against the ' barbarism ' of the Germans.

Erland van Lidth de Jeude married Annette Friend on September 22, 1986, with whom he had one son, Christiaan.

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.