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Ptolemy: Claudius Ptolemy
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Ptolemy is the English name for Claudius Ptolemaeus. He was a Greek who probably lived and worked in Alexandria, in Egypt. He lived from about 85 to 165 A.D. He is famous for his work on astronomy and geography.
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Ptolemy (... known as Claudius Ptolemaeus) was a Roman scholar who was a geographer, astronomer, and mathematician. He wrote a book about astronomy called The Almagest and created a gazetteer called The Geography.
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Claudius Ptolemaeus, better known as Ptolemy, lived and worked in the middle of the 2nd century AD. His astrological textbook - the Tetrabiblos - became the standard bearer for subsequent generations. He has been been referred to as 'the most important single figure in the history of astrology, and one of the most important in the history of astronomy'. [1]
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The Ptolemy (1934) - a large reed organ built by the American composer Harry Partch. This may have been named in tribute to Claudius Ptolemaeus, who summarized the musical work of philosophers like Pythagorus.
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In addition to his well known works in astronomy, Claudius Ptolemy was very important in the history of geography and cartography (Making maps). He was influential up to the 16th century when his ideas were disproved by Nicolaus Copernicus. Ptolemy of course knew that the Earth is a sphere. Ptolemy's is the first known projection of the sphere onto a plane. His Geography remained the main work on the subject until the time of Christopher Columbus. But he had Asia extending much too far east, which may have been a factor in Columbus's decision to try to reach India by sailing west from Europe.
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Claudius Ptolemy was born around the year 85 AD. Like Eratosthenes, he lived in Alexandria, Egypt. Ptolemy wrote books about astronomy and geography. His books were very famous and were used for more than a thousand years. Ptolemy's ideas were not all original, but he made them popular.
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Claudius Ptolemy