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astronomy
Johann Daniel Titius and the Titius-Bode Law

Johann Daniel Titius and the Titius-Bode Law

Tabea Tietz
On January 2, 1729, German astronomer Johann Daniel Titius was born. He is best known for formulating the Titius–Bode law, a hypothesis that the bodies in some orbital systems, including the Sun’s, orbit at semi-major axes in a function of planetary sequence. The formula suggests that, extending outward, each planet would be approximately twice as far from the Sun as the one before. The hypothesis correctly anticipated the orbits of Ceres and Uranus,…
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philosophy
Johann Lavater – Physiognomic Fragments for the Promotion of Human Knowledge and Human Love

Johann Lavater – Physiognomic Fragments for the Promotion of Human Knowledge and Human Love

Harald Sack
On November 15, 1741, Swiss poet, writer, philosopher, physiognomist and theologian Johann Kaspar Lavater was born. He was a main representative of physiognomics in the time of Enlightenment. “Who in the same given time can produce more than others has vigor; who can produce more and better, has talents; who can produce what none else can, has genius.” – Johann Lavater, Aphorisms on Man (1788) Johann Kaspar Lavater – Family Background and Education…
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explorer
Louis Antoine de Bougainville and his Voyage Around the World

Louis Antoine de Bougainville and his Voyage Around the World

Tabea Tietz
Probably on November 11, 1729, French admiral and explorer Louis Antoine de Bougainville was born. A contemporary of James Cook,[5] he gained fame for his expeditions, the first recorded settlement on the Falkland Islands and his voyages into the Pacific Ocean. The largest of the Solomon Islands is named after him, as is the colorful tropical climbing plant bougainvillaea. Louis Antoine de Bougainville – Early Years Louis Antoine de Bougainville was born in Paris on Rue Barre-du-Bec. His parents were…
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philosophy
Étienne de Condillac and the Importance of Language in Logical Reasoning

Étienne de Condillac and the Importance of Language in Logical Reasoning

Harald Sack
On September 30, 1714, French philosopher and epistemologist Étienne Bonnot de Condillac was born. A leading advocate in France of the ideas of John Locke de Condillac further emphasized the importance of language in logical reasoning, stressing the need for a scientifically designed language and for mathematical calculation as its basis.[4] “The art of reasoning is nothing more than a language well arranged.” – Étienne de Condillac, as quoted in [5]  Étienne de Condillac…
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mathematics
William Playfair and the Beginnings of Infographics

William Playfair and the Beginnings of Infographics

Harald Sack
On September 22, 1759, Scottish engineer and political economist William Playfair was born. He is generally considered the founder of graphical methods of statistics. William Playfair invented four types of diagrams: line graph, bar chart, pie chart, and circle graph. William Playfair Playfair was born in 1759 in Scotland during the Enlightenment, a Golden Age in the arts, sciences, industry and commerce. He was the fourth son of the reverend James Playfair…
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astronomy
John Goodricke and the Variable Star of Beta Persei

John Goodricke and the Variable Star of Beta Persei

Tabea Tietz
On September 17, 1764, English amateur astronomer John Goodricke was born. He is best known for his observations of the variable star Algol (Beta Persei) in 1782. He was also first to correctly propose that the distant sun is periodically occulted by a dark body. John Goodricke Background Not much is known about John Goodricke. Clear is only that the astronomer was deaf and passed away very early at the age of…
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physics
Baroness Dorothea von Rodde-Schlözer – Philosopher and Salonnière

Baroness Dorothea von Rodde-Schlözer – Philosopher and Salonnière

Harald Sack
On August 10, 1770, German philosopher and salonnière Baroness Dorothea von Rodde-Schlözer was born. She belonged to the group of 18th century Göttingen scholar-daughters known as “university mamselles” and was the second women in Germany to officially earn a doctorate. Dorothea Schlözer – Youth and Education Dorothea Schlözer was the daughter of August Ludwig von Schlözer, a Göttingen professor of constitutional law and history, and Caroline Friederike von Schlözer (née Roederer), a painter…
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communication
Adolph von Knigge and the Art of Human Relations

Adolph von Knigge and the Art of Human Relations

Tabea Tietz
On May 6, 1796, Freiherr Adolph Franz Friedrich Ludwig Knigge passed away. In Germany, Knigge is best remembered for his book ‘Über den Umgang mit Menschen‘ (On Human Relations), a treatise on the fundamental principles of human relations that has the reputation of being the authoritative guide to behaviour, politeness, and etiquette. “Without inspiration, which fills the soul with a healthy warmth, nothing great can ever be brought to pass.” — Adolph…
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medical science
Gustav Fechner, Psychophysics, and the Ultimate Philosophic Problem

Gustav Fechner, Psychophysics, and the Ultimate Philosophic Problem

Tabea Tietz
On April 19, 1801, German philosopher, physicist and experimental psychologist Gustav Theodor Fechner was born. An early pioneer in experimental psychology and founder of psychophysics, he inspired many 20th century scientists and philosophers. He is also credited with demonstrating the non-linear relationship between psychological sensation and the physical intensity of a stimulus, which became known as the Weber–Fechner law. “Man lives on earth not once, but three times: the first stage of…
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philosophy
Emanuel Swedenborg Visions of the Afterlife

Emanuel Swedenborg Visions of the Afterlife

Harald Sack
On March 29, 1772, Swedish scientist, philosopher, theologian, and mystic Emanuel Swedenborg passed away. He is best known for his book on the afterlife, Heaven and Hell (1758). From Swedenborg’s inventive and mechanical genius came his method of finding terrestrial longitude by the Moon, new methods of constructing docks and even tentative suggestions for the submarine and the airplane. Swedenborg had a prolific career as an inventor and scientist. In 1741, at…
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