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Ptolemy I Soter (⫽ ˈ t ɒ l əm i ⫽; Greek: Πτολεμαῖος Σωτήρ, Ptolemaîos Sōtḗr "Ptolemy the Savior"; c. 367 BC – January 282 BC) was a Macedonian Greek general, historian, and successor of Alexander the Great who went on to found the Ptolemaic Kingdom centered on Egypt and led by his progeny from 305 BC – 30 BC.
May 21, 2024 · What is Ptolemy best known for? How did Ptolemy impact the world? What were Ptolemy’s achievements? Study how Ptolemy tried to use deferents and epicycles to explain retrograde motion. Ptolemy's theory of the solar system. See all videos for this article.
- Ptolemy’s mathematical model of the universe had a profound influence on medieval astronomy in the Islamic world and Europe. The Ptolemaic system w...
- In addition to his astronomical work, Ptolemy recorded longitudes and latitudes in degrees for roughly 8,000 locations on his world map, giving a d...
- Ptolemy made contributions to astronomy, mathematics, geography, musical theory, and optics. He compiled a star catalog and the earliest surviving...
Sep 7, 2023 · Claudius Ptolemy (c. 100 to c. 170 CE) was an Alexandrian mathematician, astronomer, and geographer. His works survived antiquity and the Middle Ages intact, and his theories, particularly on a geocentric...
- Mark Cartwright
- Claudius Ptolemy is best known for being a 2nd-century Alexandrian astronomer who created a model of the universe with Earth as its centre. Ptolemy...
- Claudius Ptolemy's theory of the universe is that Earth is at the centre while the other planets and the Sun move around it. These heavenly bodies...
- Claudius Ptolemy's world map was relatively accurate for the Mediterranean region, but because nobody had been there, other parts of the world were...
Ptolemy was the only great astronomer of Roman Alexandria. Ptolemy was also a mathematician, geographer, and astrologer.
Feb 3, 2012 · Ptolemy I Soter (366-282 BCE) was one of the successor kings to the empire of Alexander the Great. He served not only as king of Egypt but also the founder of the Ptolemaic Dynasty, a dynasty which included the infamous Cleopatra VII.
- Donald L. Wasson
Learn about Claudius Ptolemy, a 2nd century Greek mathematician, astronomer and geographer who developed the geocentric theory of the universe. Find out how his work influenced medieval science and why he is a controversial figure in history.
Ptolemy explained and extended Hipparchus's system of epicycles and eccentric circles to explain the Earth-centered theory of the world. Ptolemy's system involved at least 80 epicycles to explain the motions of the Sun, the Moon, and the five planets known in his time.
