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Harald Sack

mathematics
Eratosthenes and the Circumference of the Earth

Eratosthenes and the Circumference of the Earth

Harald Sack
Eratosthenes of Cyrene was a Greek mathematician, geographer, poet, astronomer, and music theorist. He was a man of learning, becoming the chief librarian at the Library of Alexandria. He invented the discipline of geography, including the terminology used today. He is best known for being the first person to calculate the circumference of the Earth. “Eratosthenes of Cyrene, employing mathematical theories and geometrical methods, discovered from the course of the sun the…
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literature
Theodor Fontane and German Realism

Theodor Fontane and German Realism

Harald Sack
On September 20, 1898, German novelist and poet Theodor Fontane passed away. Fontane is regarded by many as the most important 19th-century German-language realist writer. A Hugenot Family in Neuruppin Theodor Fontane was born in Neuruppin, a town 30 miles northwest of Berlin, into a Huguenot family as son of the pharmacist Louis Henri Fontane. At the age of sixteen he was apprenticed to an apothecary. His further education was in Leipzig…
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medical science
Stephen Hales and the Blood Pressure

Stephen Hales and the Blood Pressure

Harald Sack
On September 17, 1677, English clergyman Stephen Hales was born. Hales made major contributions to a range of scientific fields including botany, pneumatic chemistry and physiology. He was the first person to measure blood pressure. He also invented several devices, including a ventilator, a pneumatic trough and a surgical forceps for the removal of bladder stones. In addition to these achievements was a philanthropist and wrote a popular tract on alcoholic intemperance. “We are…
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computer science
Haskell Brooks Curry and Computational Logic

Haskell Brooks Curry and Computational Logic

Harald Sack
On September 12, 1900, American mathematician and logician Haskell Brooks Curry was born. Curry’s research in the foundations of mathematics led him to the development of combinatory logic. Later, this seminal work found significant application in computer science, especially in the design of programming languages. Curry is also known for Curry’s paradox and the Curry–Howard correspondence. There are three programming languages named after him, Haskell, Brook and Curry, as well as the concept of…
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explorer
Henry Hudson’s Voyages in North America

Henry Hudson’s Voyages in North America

Harald Sack
On September 11, 1609, English sea explorer and navigator Henry Hudson after having reached the estuary of the river that carries his name today, followed the river upstream sailing along Manhattan Island. Hudson explored the region around modern New York metropolitan area while looking for a western route to Asia while in the employment of the Dutch East India Company. He explored the river which eventually was named for him, and laid…
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physics
Arthur Holly Compton and the Compton Effect

Arthur Holly Compton and the Compton Effect

Harald Sack
On September 10, 1890, American physicist and Nobel Laureate Arthur Holly Compton was born. Compton won the Nobel Prize in Physics in 1927 for his discovery of the Compton effect, which demonstrated the particle nature of electromagnetic radiation. It was a sensational discovery at the time: the wave nature of light had been well-demonstrated, but the idea that light had both wave and particle properties was not easily accepted. Arthur Holly Compton…
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space
Walter Dornberger and the Spaceplane

Walter Dornberger and the Spaceplane

Harald Sack
On September 6, 1895, German Mechanical Engineer and Army artillery officer Walter Dornberger was born. Dornberger is known as a leader of Nazi Germany‘s V-2 rocket program and other projects at the Peenemünde Army Research Center. After World War II Dornberger played a major role on the creation of the X-15 aircraft and was a key consultant for the X-20 Dyna-Soar project. He also had a role on the creation of ideas…
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medical science
Christian Archibald Herter and Gastrointestinal Diseases

Christian Archibald Herter and Gastrointestinal Diseases

Harald Sack
On September 3, 1865, American physician and pathologist Christian Archibald Herter was born. Herter is noted for his work on diseases of the gastrointestinal tract, where he investigated the role of bacteria and developed techniques for measuring their products such as indol. He was also co-founder of the Journal of Biological Chemistry. Christian Archibald Herter – Early Years Christian Archibald Herter was born in Glenville, Connecticut, USA, to Christian Herter, a notable…
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mathematics
Maurice René Fréchet and the Theory of Abstract Spaces

Maurice René Fréchet and the Theory of Abstract Spaces

Harald Sack
On September 2, 1878, French mathematician Maurice René Fréchet was born. Fréchet is known chiefly for his contribution to real analysis. He is credited with being the founder of the theory of abstract spaces, which generalized the traditional mathematical definition of space as a locus for the comparison of figures; in Fréchet‘s terms, space is defined as a set of points and the set of relations. He also made several important contributions…
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mathematics
Carl Runge and the Early Days of Numerical Mathematics

Carl Runge and the Early Days of Numerical Mathematics

Harald Sack
On August 20, 1856, German mathematician, physicist, and spectroscopist Carl Runge (Carl David Tolmé Runge) was born. He was co-developer and co-eponym of the Runge–Kutta method , a single-step method for the approximate solution of initial value problems in numerical mathematics. Carl Junge – Youth and Education Carl Runge was born in Bremen, Germany, the son of the merchant Julius Runge and his wife Fanny Tolmé, who was from England. He spent…
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