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    William Herschel, Discovered Uranus - 1781  
Sir Frederick William Herschel was a German-born British astronomer and composer who became famous for discovering Uranus. He also discovered infrared radiation and made many other discoveries in astronomy. He played the cello besides th...
 
    Eise Eisinga, Oldest working Planetarium in the World  
Eise Jeltes Eisinga was a Frisian amateur astronomer who built the Eise Eisinga Planetarium in his house in Franeker, Frisia Province in the Netherlands. The orrery still exists and is the oldest functioning planetarium in the world. Alt...
 
    Delambre, The Metric System  
In 1795 Jean Baptiste Joseph Delambre was admitted to the Bureau des Longitudes, becoming President in 1800. In 1801 he was appointed secretary to the Académie des Sciences making him the most powerful figure in science in France. In 17...
 
    Pierre-Simon Laplace, The French Newton  
Pierre-Simon, marquis de Laplace, was an influential French scholar whose work was important to the development of mathematics, statistics, physics, and astronomy. He summarized and extended the work of his predecessors in his five-volume M...
 
    Gauss, Prince of Mathematicians  
Johann Carl Friedrich Gauss was a German mathematician, who contributed significantly to many fields, including number theory, algebra, statistics, analysis, differential geometry, geodesy, geophysics, electrostatics, astronomy, Matrix theo...
 
    Fraunhofer, Founding Stellar Spectroscopy, 1814  
Joseph Ritter von Fraunhofer is known for discovering the dark absorption lines known as Fraunhofer lines in the Sun's spectrum, and for making excellent optical glass and achromatic telescope objectives. In 1814 Fraunhofer invented the...
 
    Robert Stirling, Inventor Stirling Engine  
The Reverend Dr Robert Stirling was a Scottish clergyman, and inventor of the stirling engine. He invented what he called the Heat Economiser (now generally known as the regenerator), a device for improving the thermal/fuel efficiency of a...
 
    Christian Doppler, Physicist  
Christian Andreas Doppler was an Austrian mathematician and physicist. He is celebrated for his principle — known as the Doppler effect — that the observed frequency of a wave depends on the relative speed of the source and the observer. He...
 
    Le Verrier, Co-discovery of Neptune  
Urbain Jean Joseph Le Verrier was a French mathematician who, beginning in 1838, studied the causes of perturbations in the Solar System. His work led to improved knowledge of the masses of the planets, the scale of the Solar System, and th...
 
    Galle, Discovery Neptune - 1846  
Johann Gottfried Galle was a German astronomer at the Berlin Observatory who, with the assistance of student Heinrich Louis d'Arrest, was the first person to view the planet Neptune, and know what he was looking at, on 23 September, 1846. H...
 
    John Adams, Predicted Neptune - 1841  
John Adams was an English mathematician and astronomer who predicted the existence of Neptune. While a student at Cambridge he wrote this note (found only after his death) dated Jul. 3, 1841: Formed a design at the beginning of this week of...
 
    D'Arrest, Co-discovery Neptune - 1846  
Heinrich Louis d'Arrest was a German astronomer, born in Berlin. While still a student at the University of Berlin, d'Arrest was party to Johann Gottfried Galle's search for Neptune. On September 23, 1846, he suggested that a recently drawn...
 
    Albert Einstein, Relativity Theory - 1905  
Albert Einstein was a German-born theoretical physicist. Einstein developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics). Einstein's work is also known for its influence on the philosophy...
 
    Friedmann, Expanding Universe Solution  
Alexander Alexandrovich Friedman or Friedmann was a Russian and Soviet cosmologist and mathematician. He discovered the expanding-universe solution to the general relativity field equations in 1922, which was corroborated by Edwin Hubble's...
 
    Edwin Hubble, Big Bang Theory  
Edwin Powell Hubble was an American astronomer who played a crucial role in establishing the field of extragalactic astronomy and is generally regarded as one of the most important observational cosmologists of the 20th century. Hubble is k...
 
       
 
         
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