The Greek astronomer, astrologer, and geographer Claudius Ptolemy (ca. 100-ca. 170) established the system of mathematical astronomy that remained standard in Christian and Moslem countries until the 16th century. Ptolemy is known to have made...

Claudius Ptolemy was a famed Greek scholar whose work in astronomyand geometryhelped form the basis of trigonometry.Ptolemy's earliest and most famous work was the Almagest, which focused on astronomy. In it, he developed geometrical proofs, which...

Very little is known about Ptolemy's early life. Born in Alexandria, Egypt, as Ptolemais Hermii, his name was later latinized as Claudius Ptolemaeus, and later Ptolemy. Ptolemy's chief contribution to science is a series of books in which he compiled...

PTOLEMY (c. 100–170), Alexandrian astronomer, geographer, and mathematician. The last of the great astronomers of antiquity, Claudius Ptolemaeus (Ptolemy) compiled works that remained the standard astronomical textbooks until the Copernican...

c. 100-c. 170 Greek Astronomer and Geographer Ptolemy is known historically through his written works. His earliest and most noted treatise is the 13-volume set commonly known as the Almagest, which he probably wrote around 150. In these books, he...

Greek astronomer Very little is known about Ptolemy's early life. Born in Alexandria, Egypt, as Ptolemais Hermii, his name was later latinized as Claudius Ptolemaeus, and later Ptolemy. Ptolemy's chief contribution to science is a series...

100?-170? Greek mathematician, astronomer, and geographer whose major work, the Almagest, is a large mathematical text that describes the movement of the heavens. A Roman citizen of Greek descent living in Alexandria, Egypt, he was the most influential...

Claudius Ptolemaeus (Greek: Κλαύδιος Πτολεμαῖος; after 83 – 161 AD), known in English as Ptolemy, was a Greek[1] or Egyptian[2] mathematician, geographer, astronomer, and astrologer who flourished in Roman Egypt. He was probably...

A stolen 15th century map dating to the dawn of modern printing, a decade before Christopher Columbus sailed to America, was returned to Spain on Monday.The map was discovered missing from Spain's National Library in August, cut out of a 1482 edition of Claudius Ptolemy's...

German Chancellor Angela Merkel on Monday officially handed over to the United States the 500-year-old map that was the first to tell the world of a new land it called America.Library of Congress historians say the world map, completed by German-born cleric and cartographer Martin...

The great idea that led Columbus to conquer the ocean in 1492 was that the world was small enough to reach the riches and spices of the East by sailing west.Columbus always would remain convinced that he had opened a new trade route to the...

Centuries before it became a continent or country synonymous with wealth, power, freedom or democracy, "America" was coined by a Renaissance cartographer as the catchall designation for a world that Europeans had yet to name or explore.The name stuck despite its humble history and unsure...