Paolo dal Pozzo Toscanelli was an Italian mathematician, astronomer, and cosmographer. Toscanelli is noted for his observations of comets and the painstaking calculation of their orbits. Among these was the comet of 1456; only named Halley'...

Nicholas of Kues, also referred to as Nicolaus Cusanus and Nicholas of Cusa, was a cardinal of the Catholic Church from Germany (Holy Roman Empire), a philosopher, jurist, mathematician, and an astronomer. He is widely considered one of the...

Johannes Müller von Königsberg, today best known by the Latin epithet Regiomontanus, was a German mathematician, astronomer, astrologer, translator, instrument maker and Catholic bishop. He was born in the Franconian village of Unfinden,...

Nicolaus Copernicus was a Renaissance- and Reformation-era mathematician and astronomer who formulated a model of the universe that placed the Sun rather than the Earth at the center of the universe, likely independently of Aristarchus of S...

John Dee was a noted British mathematician, astronomer, astrologer, geographer, and consultant to Queen Elizabeth I. He also devoted much of his life to alchemy, divination, and Hermetic philosophy. Dee straddled the worlds of science and...

William Gilbert, also known as Gilberd, was an English physician, physicist and natural philosopher. He was an early Copernican, and passionately rejected both the prevailing Aristotelian philosophy and the Scholastic method of university t...

Tycho Brahe was born in Skane, then in Denmark, now in Sweden. His contributions to astronomy were enormous. He not only designed and built instruments, he also calibrated them and checked their accuracy periodically. He thus revolutionized...

Giordano Bruno was an Italian Dominican friar, philosopher, mathematician, poet, and cosmological theorist. He is known for his cosmological theories, which conceptually extended the then-novel Copernican model. He proposed that the stars w...

John Napier was a Scottish mathematician, physicist, astronomer & astrologer, and also the 8th Laird of Merchistoun. He was the son of Sir Archibald Napier of Merchiston. John Napier is most renowned as the discoverer of the logarithm. Napi...

Petrus Plancius was a Dutch astronomer, cartographer and clergyman. He was soon recognized as an expert on the shipping routes to India. He strongly believed in the idea of a North East passage until the failure of Willem Barentsz's third v...

Galileo Galilei was an Italian polymath: astronomer, physicist, engineer, philosopher, and mathematician. He has been called the "father of observational astronomy", the "father of modern physics", the "father of the scientific method", and...

Frederick de Houtman was a Dutch explorer, navigator, and colonial governor who sailed along the coastal regions of western Australia on the first Dutch expedition to the East Indies from 1595 until 1597, during which time he made observati...

Johannes Kepler was a German mathematician, astronomer, and astrologer. A key figure in the 17th century scientific revolution, he is best known for his laws of planetary motion, based on his works Astronomia nova, Harmonices Mundi, and Epi...

Willebrord Snellius was a Dutch astronomer and mathematician, known in the English-speaking world as Snell. In the west, especially the English speaking countries, his name has been attached to the law of refraction of light for several cen...

The calendar used throughout the world today is the Gregorian calendar. It is sometimes called a "Christian" calendar. The Gregorian calendar is the one commonly used today. It was proposed by Aloysius Lilius, a physician from Naples, and a...