File: Glaspalast München 1890 165. jpg | Johannes Karel Christiaan Klinkenberg, ' Amsterdam ' ( Ulmus x hollandica ‘ Belgica ’ )

The battle took place on December 25, 1901 when General Christiaan De Wet destroyed a British column.

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.

* April 14 – Christiaan Huygens, Dutch scientist ( d. 1695 )

Christiaan Huygens, FRS ( or ; ; 14 April 1629 – 8 July 1695 ) was a prominent Dutch mathematician, astronomer, physicist and horologist.

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.

Bastiaan Johan Christiaan " Bas Jan " Ader ( born April 19, 1942 Winschoten, The Netherlands-lost at sea in 1975 between Cape Cod, Massachusetts and Ireland ) was a conceptual artist, performance artist, photographer and filmmaker.

Troops led by General Christiaan de Wet attacked a convoy of 600 of the Royal Irish Rifles on April 4, 1900, and obtained their surrender the next day.

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

* 1858 – Christiaan Eijkman, Dutch physician, Nobel Prize laureate ( d. 1930 )

Christiaan Neethling Barnard ( 8 November 1922 – 2 September 2001 ) was a South African cardiac surgeon who performed the world's first successful human-to-human heart transplant.

* 1967 – At Groote Schuur Hospital in Cape Town, South Africa, a transplant team headed by Christiaan Barnard carries out the first heart transplant on a human ( 53-year-old Louis Washkansky ).

* Christiaan Huygens 1629 – 1695 ( Netherlands )

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.

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

* 1930 – Christiaan Eijkman, Dutch physician and pathologist, recipient of the Nobel Prize in Physiology or Medicine ( b. 1858 )

* 1922 – Christiaan Barnard, South African heart surgeon ( d. 2001 )

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.

* September 2 – Christiaan Barnard, South African surgeon ( b. 1922 )

* Physiology or Medicine – Christiaan Eijkman, Sir Frederick Gowland Hopkins

* December 3 – Christiaan Barnard carries out the world's first heart transplant at Groote Schuur Hospital in Cape Town.

* November 8 – Christiaan Barnard, South African surgeon ( d. 2001 )

* July 8 – Christiaan Huygens, Dutch mathematician and physicist who developed the wave theory of light ( b. 1629 )

* November 5 – Christiaan Eijkman, Dutch physician and pathologist, recipient of the Nobel Prize in Physiology or Medicine ( b. 1858 )

* August 11 – Christiaan Eijkman, Dutch physician and pathologist, recipient of the Nobel Prize in Physiology or Medicine ( d. 1930 )

* December – The pendulum clock is invented by Christiaan Huygens.

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.

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 ).

The first success was achieved on December 3, 1967, by Christiaan Barnard in Cape Town, South Africa.

Denise Ann Darvall ( 1943 – 3 December 1967 ) was the donor in the world ’ s first successful human heart transplant, performed at Groote Schuur Hospital, South Africa, by a team of surgeons led by Christiaan Barnard.

* 3 December-Professor Christiaan Barnard carries out the world's first heart transplant at Groote Schuur Hospital in Cape Town

On the Boer side, the government was led by state president Martinus Theunis Steyn ( 1857 – 1916 ) until 30 May 1902, when he went on sick-leave and was replaced by general Christiaan de Wet as acting state president.

Jan Christiaan Smuts, OM, CH, ED, KC, FRS, PC ( 24 May 1870 – 11 September 1950 ) was a prominent South African and British Commonwealth statesman, military leader and philosopher.

The following year, Sir Frederick Hopkins postulated that some foods contained " accessory factors "— in addition to proteins, carbohydrates, fats, and salt — that were necessary for the functions of the human body .< ref > Christiaan Eijkman, Beriberi and Vitamin B < sub > 1 </ sub >, Official Web Site of the Nobel Foundation </ ref > In 1901, Gerrit Grijns ( May 28, 1865 – November 11, 1944 ), a Dutch physician and assistant to Christiaan Eijkman in the Netherlands correctly interpreted the disease as a deficiency syndrome, and between 1910 and 1913, Dr. Edward Bright Vedder established that an extract of rice bran is a treatment for beriberi.

Sir Frederick Gowland Hopkins OM FRS ( 20 June 1861 – 16 May 1947 ) was an English biochemist who was awarded the Nobel Prize in Physiology or Medicine in 1929, with Christiaan Eijkman, for the discovery of vitamins.

Christiaan Frederick Beyers Naudé ( 10 May 1915 – 7 September 2004 ) was a South African cleric, theologian and the leading Afrikaner anti-apartheid activist.

Hamilton Naki ( 26 June 1926 – 29 May 2005 ) was a black laboratory assistant to white cardiac surgeon Christiaan Barnard in South Africa under apartheid.

Thomas Bernhard's House, Video by Christiaan Tonnis, 2006

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

It was designed by architect Louis Christiaan Kalff, while the exhibition was conceived by James Gardner.

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

This phenomenon was first observed by Christiaan Huygens in 1665.

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 ).

The earliest comprehensive theory of light was advanced by Christiaan Huygens, who proposed a wave theory of light, and in particular demonstrated how waves might interfere to form a wavefront, propagating in a straight line.

The first engagement of this new form of warfare was at Sanna's Post on 31 March where 1, 500 Boers under the command of Christiaan De Wet attacked Bloemfontein's waterworks about east of the city, and ambushed a heavily escorted convoy, which caused 155 British casualties and the capture of seven guns, 117 wagons, and 428 British troops.

A bitter dispute between Hooke and Christiaan Huygens on the priority of this invention was to continue for centuries after the death of both ; but a note dated 23 June 1670 in the Hooke Folio ( see External links below ), describing a demonstration of a balance-controlled watch before the Royal Society, has been held to favour Hooke's claim.

Although mathematics was not part of his course work, de Moivre read several mathematical works on his own including Elements de mathematiques by Father Prestet and a short treatise on games of chance, De Ratiociniis in Ludo Aleae, by Christiaan Huygens.

His place was taken by acting president J. Christiaan Heunis.

Van Schooten's father was a professor of mathematics at Leiden, having Christiaan Huygens, Johann van Waveren Hudde, and René de Sluze as students.

He was secretary to two Princes of Orange: Frederick Henry and William II, and the father of the scientist Christiaan Huygens.

Constantijn Huygens was born in The Hague, the second son of Christiaan Huygens ( senior ), secretary of the Council of State, and Susanna Hoefnagel, niece of the Antwerp painter Joris Hoefnagel.

A week later he was buried in the Grote Kerk in the Hague, together with his son, the famous scientist Christiaan Huygens.

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.