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Johannes Kepler

astronomy
Tycho Brahe – The Man with the Golden Nose

Tycho Brahe – The Man with the Golden Nose

Harald Sack
On December 14, 1546, Danish nobleman and astronomer Tycho Brahe, known for his accurate and comprehensive astronomical and planetary observations was born. “Non haberi, sed esse.” “Not shine, but be.” – Tycho Brahe’s Election slogan Background Tycho Brahe was born at Knutstorp Castle, Scania, at that time Denmark, into a politically powerful family of noblemen and political advisors. He grew up with his uncle, also a nobleman, who supplied his nephew with a…
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astronomy
Much More Powerful Than Expected – Kepler’s Supernova

Much More Powerful Than Expected – Kepler’s Supernova

Tabea Tietz
On October 17, 1604, the famous German astronomer Johannes Kepler [5] started his observations of the 1604 supernova, named after him as Kepler’s Supernova or Kepler’s Star. Special about this ‘new’ star was it being the very last observed supernova in our own galaxy, the Milky way. First Sightings The supernova was first observed on 9 October 1604 by Ilario Altobelli in Verona and Raffaello Gualterotti in Florence, a few days before Kepler…
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physics
Sir Isaac Newton and the famous Principia

Sir Isaac Newton and the famous Principia

Harald Sack
On July 5, 1687, Sir Isaac Newton published his Philosophiae Naturalis Principia Mathematica (in Latin). The Principia states Newton’s laws of motion, forming the foundation of classical mechanics; Newton’s law of universal gravitation; and a derivation of Kepler’s laws of planetary motion (which Kepler first obtained empirically).[6] It is to be considered as the most influential work of Isaac Newton and as one of the greatest scientific works of all time. “The ancients…
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astronomy
And Kepler Has His Own Opera – Kepler’s 3rd Planetary Law

And Kepler Has His Own Opera – Kepler’s 3rd Planetary Law

Harald Sack
On May 15, 1618, famous astronomer Johannes Kepler discovered the 3rd and also last of his planetary laws, and concluded the general revolution of our celestial world that started with Nicolaus Copernicus about 100 years earlier.[1] And that made him rather popular as he still is today. Did you know that there is a Kepler crater on the Moon, a Kepler crater on Mars, a Kepler asteroid, a Kepler supernova, of course there…
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astronomy
The Discovery of the Four Galilean Moons

The Discovery of the Four Galilean Moons

Harald Sack
On January 7, 1610, physicist and astronomer Galileo Galilei turned his new telescope to the nocturnal sky to watch the planet Jupiter and discovered the eponymous four moons of Jupiter, Ganimede, Callisto, Io, and Europa although he is not able to distinguish the last two until the following day.[1,2] The Telescope Based only on uncertain descriptions of the first practical telescope which the Dutch lens maker Hans Lippershey [3] tried to patent in the Netherlands…
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mathematics
Aryabhata and Early Indian Mathematics

Aryabhata and Early Indian Mathematics

Harald Sack
In 476 CE, Indian mathematician and astronomer Aryabhata was born. Aryabhata is the earliest Indian mathematician whose work and history are available to modern scholars. In his work “Ganita” Aryabhata names the first 10 decimal places and gives algorithms for obtaining square and cubic roots, using the decimal number system. He also came up with an approximation of pi and the area of a triangle. “Aryabhata is the master who, after reaching…
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physics
Stephen Hawking and the Hairy Black Holes

Stephen Hawking and the Hairy Black Holes

Harald Sack
When I read the news that Stephen Hawking passed away, I was rather sad. I grew up with a fascination for astronomy and cosmology. Trying to understand the fabrics and working of the universe, I devoured his popular books and articles and I am rather thankful. Amongst others it was foremost this unique physicist, who planted the seed for my decision to become a scientist myself. However, I abandoned physics after high…
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astronomy

Johannes Fabricius and the Observation of Sunspots

Tabea Tietz
Probably on June 13, 1611, Frisian astronomer Johannes Fabricius published his Narratio de maculis in sole observatis et apparente earum cum sole conversione (Account of Spots Observed on the Sun and of Their Apparent Rotation with the Sun), which counts as the first published description of sunspots. Nevertheless, sunspots have been discovered earlier, as the first record of a sunspot drawing dates back into the 12th century to John of Worcester in 1128. Johannes…
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mathematics
Cavalieri’s Principle

Cavalieri’s Principle

Harald Sack
On November 30, 1648, Italian mathematician Bonaventura Cavalieri passed away. He is known for his work on the problems of optics and motion, work on the precursors of infinitesimal calculus, and the introduction of logarithms to Italy. Cavalieri’s principle in geometry partially anticipated integral calculus. “Rigor is the concern of philosophy not of geometry.” (Bonaventura Cavalieri) Bonaventura Cavalieri – The Youth of a Mathematician Born at Milan, Cavalieri was given the name Francesco…
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