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59 years
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Johannes Kepler was a German mathematician, astronomer, and astrologer. A key figure in the 17th century scientific revolution, he is best known for his laws of planetary motion, based on his works Astronomia nova, Harmonices Mundi, and Epitome of Copernican Astronomy. These works also provided one of the foundations for Isaac Newton's theory of universal gravitation.
During his career, Kepler was a mathematics teacher at a seminary school in Graz, Austria, where he became an associate of Prince Hans Ulrich von Eggenberg. Later he became an assistant to astronomer Tycho Brahe, and eventually the imperial mathematician to Emperor Rudolf II and his two successors Matthias and Ferdinand II. He was also a mathematics teacher in Linz, Austria, and an adviser to General Wallenstein. Additionally, he did fundamental work in the field of optics, invented an improved version of the refracting telescope (the Keplerian Telescope), and mentioned the telescopic discoveries of his contemporary Galileo Galilei....
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Johannes Kepler was a German mathematician, astronomer, and astrologer. A key figure in the 17th century scientific revolution, he is best known for his laws of planetary motion, based on his works Astronomia nova, Harmonices Mundi, and Epitome of Copernican Astronomy. These works also provided one of the foundations for Isaac Newton's theory of universal gravitation.
During his career, Kepler was a mathematics teacher at a seminary school in Graz, Austria, where he became an associate of Prince Hans Ulrich von Eggenberg. Later he became an assistant to astronomer Tycho Brahe, and eventually the imperial mathematician to Emperor Rudolf II and his two successors Matthias and Ferdinand II. He was also a mathematics teacher in Linz, Austria, and an adviser to General Wallenstein. Additionally, he did fundamental work in the field of optics, invented an improved version of the refracting telescope (the Keplerian Telescope), and mentioned the telescopic discoveries of his contemporary Galileo Galilei....
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The Sun, Center of our Solar System
The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process. It is by far the most important source of energy for life on Ear... |
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Ptolemy, Astronomer / Mathematician
Claudius Ptolemy was a Greco-Egyptian writer of Alexandria, known as a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology. He lived in the city of Alexandria in the Roman province of Egypt, wrote in... |
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Copernicus, Earth moves around the Sun
Nicolaus Copernicus was a Renaissance- and Reformation-era mathematician and astronomer who formulated a model of the universe that placed the Sun rather than the Earth at the center of the universe, likely independently of Aristarchus of Samos, who... |
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Tycho Brahe, Danish Astronomer
Tycho Brahe was born in Skane, then in Denmark, now in Sweden. His contributions to astronomy were enormous. He not only designed and built instruments, he also calibrated them and checked their accuracy periodically. He thus revolutionized astronomi... |
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Rudolf II, Holy Roman Emperor
Rudolf II, Holy Roman Emperor as Rudolf II (1576-1612), King of Hungary as Rudolf (1572-1608), King of Bohemia as Rudolf II (1575-1608/1611) and Archduke of Austria as Rudolf V (1576-1608). He was a member of the Habsburg family. Rudolf's legacy has... |
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Matthias, Holy Roman Emperor
Matthias was Holy Roman Emperor from 1612, King of Hungary and Croatia from 1608 (as Matthias II) and King of Bohemia from 1611. He was a member of the House of Habsburg.... |
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Galileo Galilei, Father of Modern Science
Galileo Galilei was an Italian polymath: astronomer, physicist, engineer, philosopher, and mathematician. He has been called the "father of observational astronomy", the "father of modern physics", the "father of the scientific method", and the "fath... |
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Ferdinand II, Holy Roman Emperor
Ferdinand II, Holy Roman Emperor, of the house of Habsburg, ruled 1620-1637. Originally Archduke of Styria, his appointment as King of Bohemia was one of the causes of the Thirty Years' War. He was also the emperor of the Holy Roman Empire during mos... |
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Albrecht von Wallenstein
Wallenstein was a Bohemian soldier and politician who gave his services (an army of 30,000 to 100,000 men) during the Danish Period of the Thirty Years' War to Ferdinand II for no charge except the right to plunder the territories that he conquered.... |
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Isaac Newton, Theory of Gravitation
Sir Isaac Newton was an English mathematician, astronomer, and physicist (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time and a key figure in the scientific revolutio... |
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Edwin Hubble, Big Bang Theory
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Nasa, National Aeronautics and Space Act
The National Aeronautics and Space Administration (NASA) is the United States government agency that is responsible for the civilian space program as well as for aeronautics and aerospace research.
President Dwight D. Eisenhower established the Na... |
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