Tycho Brahe

Ole Rømer and the Speed of Light

Ole Rømer and the Speed of Light

On October 5, 1644 (or according to the old julian calendar September 25), Danish astronomer Ole Christensen Rømer was born. He became known by the first proof published in 1676 that the speed of light is finite and not infinite, respectively by the guidance, how the speed of light can be calculated by observation of the Jupiter moons. Ole Rømer – Early Years Ole Rømer was born in Århus, Denmark, to merchant and skipper…
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David Fabricius and the Wonders of the Heavens

David Fabricius and the Wonders of the Heavens

On August 13, 1596, German theologian and astronomer David Fabricius discovered the first known periodic variable star, which he called Mira Ceti (The ‘Wonder’ in the stellar constellation ‘Whale’). David Fabricius – Early Years David Fabricius was born in Esens, Lower Saxony and received a pretty good education, learning mostly Latin. In Braunschweig, he first gained a few experiences in astronomy. His teacher introduced him to astronomy as well as mathematics before…
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John Dee and his World of Science and Magic

John Dee and his World of Science and Magic

On July 13, 1527, Welsh mathematician, astronomer, astrologer, occultist, navigator, imperialist and consultant to Queen Elizabeth I, John Dee was born. He is considered one of the most learned men of his age. Besides being an ardent promoter of mathematics and a respected astronomer, in his later years he immersed himself in the worlds of magic, astrology and Hermetic philosophy. One of his aims was attempting to commune with angels in order to…
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Nikolaus Copernicus and the Heliocentric Model

Nikolaus Copernicus and the Heliocentric Model

On February 19, 1473, Renaissance mathematician and astronomer Nikolaus Copernicus was born, who established the heliocentric model, which placed the Sun, rather than the Earth, at the center of the universe. With the publication of his research he started the so-called Copernican Recolution, which started a paradigm shift away from the former Ptolemaic model of the heavens, which postulated the Earth at the center of the universe, towards the heliocentric model with the…
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Giovanni Domenico Cassini and the Moons of Saturn

Giovanni Domenico Cassini and the Moons of Saturn

On December 23, 1672, Italian astronomer Giovanni Domenico Cassini discovered Rhea, the 2nd largest of the 62 Saturn moons that are known by today. Background and Education Giovanni Cassini Cassini was born in Perinaldo (Liguria). He married the rich Geneviève de Laistre, became a French citizen in 1673 and began to write his first name Jean-Dominique. Cassini studied at the Jesuit College in Genoa and Bologna. Through the influence of the former…
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Tycho Brahe – The Man with the Golden Nose

Tycho Brahe – The Man with the Golden Nose

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

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

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 Nikolaus Kopernikus 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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John Dreyer and the New General Catalogue of Nebulae and Clusters

John Dreyer and the New General Catalogue of Nebulae and Clusters

On February 13, 1852, Danish-Irish astronomer John Louis Emil Dreyer was born. Dreyer’s major contribution was the monumental New General Catalogue of Nebulae and Clusters of Stars (based on William Herschels Catalogue of Nebulae), the catalogue numbers of which are still in use today. Education and Assistant to Lord Rosse John Louis Emil Dreyer was born in Copenhagen, Denmark, the son of Lieutenant General John Christopher Dreyer, back then the Danish Minister for…
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Pierre Gassendi and his Trials to reconcile Epicurean atomism with Christianity

Pierre Gassendi and his Trials to reconcile Epicurean atomism with Christianity

You have read the title? I guess, you might be scared now, but Pierre Gassendi was a decent fellow… On January 22, 1592, French philosopher, priest, scientist, astronomer, and mathematician. Pierre Gassendi was born. Gassendi revived Epicureanism as a substitute for Aristotelianism, attempting in the process to reconcile Atomism‘s mechanistic explanation of nature with Christian belief in immortality, free will, an infinite God, and creation.He clashed with his contemporary Descartes on the possibility…
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Simon Marius and his Astronomical Discoveries

Simon Marius and his Astronomical Discoveries

On January 20 (or January 10 according to the old Julian calendar), 1573, German astronomer Simon Marius was born. Marius was pupil of Tycho Brahe, one of the earliest users of the telescope and the first in print to make mention the Andromeda nebula. He studied and named the four largest moons of Jupiter that he claimed to have them discovered independently and even before Galileo. Simon Marius was born in Gunzenhausen, near…
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