Giovanni Cassini

Jean Picard and his Love for Accuracy

Jean Picard and his Love for Accuracy

On July 21, 1620, French astronomer, cartographer and hydraulic engineer Jean-Félix Picard was born. He is regarded as the founder of modern astronomy in France. He introduced new methods, improved the old instruments, and added new devices, such as Huygens‘ pendulum clock to record times and time intervals. Background Jean Picard Jean-Félix Picard was born as a son of a bookseller and was allowed to study at the Jesuit Collège Royal Henry-Le-Grand, which…
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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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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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Christiaan Huygens and the Discovery of Saturn Moon Titan

Christiaan Huygens and the Discovery of Saturn Moon Titan

On March 25, 1655, Saturn‘s largest moon Titan was discovered by astronomer and physicist Christiaan Huygens. Titan is considered as the most Earth-like moon discovered so far and the second largest in the solar system. Christian Huygens’ Background Christiaan Huygens was born into an influential family and provided with a decent education all his life, leaning several foreign languages mathematics, logic, and rethoric. His father was friends with Galileo Galilei and René…
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Roger Cotes and Newton’s Principia Mathematica

Roger Cotes and Newton’s Principia Mathematica

On July 10, 1682, English mathematician Roger Cotes was born. Cotes is well known for working closely with Isaac Newton by proofreading the second edition of his famous book, the Philosophiae Naturalis Principia Mathematica,[4] before publication. He also invented the quadrature formulas known as Newton–Cotes formulas and first introduced what is known today as Euler’s formula. “If he had lived we would have known something.”, Remark of Issac Newton on the early…
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Pierre Bouguer – Child Prodigy and ‘Father of Photometry’

Pierre Bouguer – Child Prodigy and ‘Father of Photometry’

On February 16, 1698, French mathematician, geophysicist, geodesist, and astronomerPierre Bouguer was born. In 1735 Bouguer sailed with Charles Marie de La Condamine on a scientific mission to Peru, in order to measure a degree of the meridian arc near the equator. He is also known as “the father of naval architecture” and the “father of photometry“. Pierre Bouguer – Early Life Pierre Bouguer was educated in mathematics and hydrography by his…
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