Italian polymath Gerolamo Cardano is best known for his iconic work Ars magna, or The Great Art, which contributed immensely to the field of algebra. Throughout his illustrious life, he had been a physician, a math lecturer, and an astrologer. He was also the first to describe typhus fever clinically.
William Gilbert was a 16th-century English physician, physicist, astronomer, and natural philosopher. He earned his MD from Cambridge and practiced medicine in London. He was a much-respected figure and was made the president of the Royal College of Physicians. He served as Queen Elizabeth I's and King James VI and I’s personal physician.
French Catholic priest and astronomer Pierre Gassendi is remembered for his efforts to reconcile atomism with Christian ideals and for his anti-Aristotelianism. His studies included research on Epicurean philosophy. Apart from observing the transit of Mercury, he also studied the speed of sound and horizontal momentum.
Willebrord Snell was a Dutch mathematician and astronomer. He is credited with rediscovering the law of refraction, which is named Snell's law in his honor. A much-revered mathematician in the Netherlands, Willebrord Snell was honored by the Royal Netherlands Navy by naming three of its survey ships after him. Snellius, a lunar crater, is also named in his honor.
Christopher Clavius was a Jesuit German astronomer and mathematician. Clavius was one of the members of the Vatican commission that gave a green signal to Aloysius Lilius' calendar which came to be known as the Gregorian calendar. He was one of Europe's most respected astronomers; his books were used for over 50 years for astronomical education in and around Europe.
Simon Marius was a German astronomer who was one of the first observers of Jupiter's four largest moons. He was charged with plagiarism for publishing his discovery. He is now credited with naming the moons of Jupiter. Simon Marius is also remembered for being Galileo Galilei's one of foremost rivals.
10 Johann Bayer
Johann Bayer was a German uranographer and lawyer. He is best remembered for gauging the positions of several objects on the celestial sphere. His book Uranometria, which was published in 1603, publicized a system of identifying stars that are visible to the naked eye. The moon’s crater Bayer is named so in his honor.
11 Oronce Finé
Sixteenth-century French mathematician Oronce Finé was also a skilled cartographer. Some of his best works remain his heart-shaped map of the world, his ivory sundial, and his woodcut map of France. He also earned a degree in medicine and was imprisoned for opposing the French king’s concordat to universities.
Having lost his doctor father to an execution after he was charged with stealing from his patients, Georg Joachim Rheticus ditched his paternal surname. The Austrian-born mathematician is best remembered for his tables of trigonometric functions. He was also one of the first to propagate the Copernican heliocentric theory.
Petrus Apianus was a German humanist whose published works pertaining to geography and astronomy are considered one of the most important works of his time. His works, such as Cosmographicus liber (1524) and Astronomicum Caesareum (1540), which were translated into several languages were being published even after his death.
14 Sophia Brahe
Aloysius Lilius, also known as Luigi Lilio, is best remembered as the main author of the Gregorian Calendar. Well-versed in medicine and astronomy, Lilius hailed from Calabria, Italy, though not much is known about his life. His calendar was presented to Pope Gregory XIII by his brother Antonio.
Once a Lutheran pastor, Michael Maestlin later became one of the greatest astronomers from Germany. He was one of the first to teach the heliocentric Copernican theory and later became famous as the mentor of Johannes Kepler. He was also apparently the first to measure the orbit of a comet.
German mathematician, astronomer, poet, and Renaissance humanist Philipp Nikodemus Frischlin began his career as a professor of poetry and history and later studied the works of Virgil. He was later arrested for defamation and imprisoned at a fortress. He fell to his death while trying to escape his cell.