https://www.britannica.com/biography/Ptolemy
Ptolemy's theory of the solar system. Ptolemy (born c. 100 ce —died c. 170 ce) was an Egyptian astronomer, mathematician, and geographer of Greek descent who flourished in Alexandria during the 2nd century ce. In several fields his writings represent the culminating achievement of Greco-Roman science, particularly his geocentric (Earth

https://en.wikipedia.org/wiki/Ptolemy_I_Soter
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. Ptolemy was basileus and pharaoh of Ptolemaic Egypt from

https://www.worldhistory.org/Claudius_Ptolemy/
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 model of the universe with planets following orbits within orbits, were hugely influential until they were replaced by the heliocentric model of the universe proposed by Copernicus and Galileo.

https://www.worldhistory.org/Ptolemy_I/
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.. Early Life & Persian Campaign. Ptolemy was a Macedonian nobleman, son of Lagos. Rumors circulated, however, that he was actually the illegitimate son of

https://www.worldhistory.org/Ptolemaic_Dynasty/
Ptolemy I Soter (Savior) (366-282 BCE) was a Macedonian nobleman and, according to most sources, the son of Lagos and Arsinoe. He had been a childhood friend of Alexander, his official taster, bodyguard, and even possibly a relative; rumors abound that he was the illegitimate son of Philip II, Alexander's father.After the king's death, he led the campaign to divide the empire among the leading

https://www.khanacademy.org/humanities/big-history-project/big-bang/how-did-big-bang-change/a/claudius-ptolemy
Ptolemy was the only great astronomer of Roman Alexandria. Ptolemy was also a mathematician, geographer, and astrologer. Befitting his diverse intellectual pursuits, he had a motley cultural makeup: he lived in Egypt, wrote in Greek, and bore a Roman first name, Claudius, indicating he was a Roman citizen — probably a gift from the Roman

https://www.newscientist.com/people/claudius-ptolemy/
Learn about Claudius Ptolemy, the 2nd century scholar who developed the geocentric theory of the universe and the global coordinates system. Find out why he is controversial and how his work influenced medieval science and astronomy.

https://www.britannica.com/summary/Ptolemy
Ptolemy , Latin Claudius Ptolemaeus, (born c. ad 100—died c. ad 170), Greek astronomer and mathematician. He worked principally in Alexandria. It is often difficult to determine which findings in his great astronomical book, the Almagest, are Ptolemy's and which are Hipparchus's. The Sun, Moon, planets, and stars, he believed, were attached to crystalline spheres, centred on Earth, which

https://mathshistory.st-andrews.ac.uk/Biographies/Ptolemy/
The Almagest is the earliest of Ptolemy's works and gives in detail the mathematical theory of the motions of the Sun, Moon, and planets. Ptolemy made his most original contribution by presenting details for the motions of each of the planets. The Almagest was not superseded until a century after Copernicus presented his heliocentric theory in

https://www.britannica.com/biography/Ptolemy-I-Soter
Ptolemy I Soter (born 367/366 bc, Macedonia—died 283/282, Egypt) was a Macedonian general of Alexander the Great, who became ruler of Egypt (323-285 bc) and founder of the Ptolemaic dynasty, which reigned longer than any other dynasty established on the soil of the Alexandrian empire and only succumbed to the Romans in 30 bc.

https://www.famousscientists.org/claudius-ptolemy/
Learn about Claudius Ptolemy, the ancient astronomer who wrote the Almagest, a comprehensive treatise on astronomy and star catalog. Discover his cosmology, trigonometry, planet model and legacy.

https://www.skyatnightmagazine.com/space-science/ptolemy
The life of Ptolemy, ancient astronomer - BBC Sky at Night Magazine. Claudius Ptolemaeus (circa AD 100-170), better known as Ptolemy, was a Greco-Roman astronomer, mathematician, geographer and cartographer.

https://famous-mathematicians.org/ptolemy/
Ptolemy's "geocentric" system was accepted for some 1,400 years. In the Ptolemaic system, the earth was not described as flat - as was the general belief - but as a sphere. Although the system was incorrect in that it was an earth-centered system in which the earth did not move, and the stars fixed, it nevertheless was highly useful

https://simple.wikipedia.org/wiki/Ptolemy
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. He believed the planets and sun moved around the Earth in this order: Mercury, Venus, Sun, Mars, Jupiter, Saturn. [3] This system became known as the Ptolemaic system. It predicts the positions of the planets well

https://www.encyclopedia.com/people/science-and-technology/astronomy-biographies/ptolemy
Ptolemy was a Greek astronomer and mathematician who lived in Alexandria in the second century A.D. He wrote several influential works on astronomy, mathematics, astrology, and geography, such as the Almagest, the Tetrabiblos, and the Geography.

https://www.newworldencyclopedia.org/entry/Ptolemy
Ptolemy, or in Latin Claudius Ptolemaeus (ca. 90 - ca. 168 C.E. ), was a mathematician, philosopher, geographer, map maker, astronomer, theologian, and astrologer who lived in Alexandria, Egypt. He is most remembered because of his development of the geocentric (Earth-centered) cosmological system, known as the Ptolemaic system or Ptolemaic

https://www.thoughtco.com/claudius-ptolemy-3071076
Claudius Ptolemy (often called Claudius Ptolemaeus, Ptolomaeus, Klaudios Ptolemaios, and simply Ptolemeus) was one of the earliest of these observers. He systematically charted the sky to help predict and explain the motions of the planets and stars. He was a scientist and philosopher who lived in Alexandria, Egypt nearly 2,000 years ago.

https://en.wikipedia.org/wiki/Ptolemaic_dynasty
The Ptolemaic dynasty (/ ˌ t ɒ l ɪ ˈ m eɪ. ɪ k /; Ancient Greek: Πτολεμαῖοι, Ptolemaioi), also known as the Lagid dynasty (Λαγίδαι, Lagidai; after Ptolemy I's father, Lagus), was a Macedonian Greek royal house which ruled the Ptolemaic Kingdom in Ancient Egypt during the Hellenistic period.Reigning for 275 years, the Ptolemaic was the longest and last dynasty of ancient

https://www.thoughtco.com/ptolemy-biography-1435025
Ptolemy's Contributions to Geography. Roman Scholar Claudius Ptolemaeus. Not much is known about the life of the Roman scholar Claudius Ptolemaeus who is more commonly known as Ptolemy. However, he was estimated to have lived from approximately 90 to 170 CE and worked in the library at Alexandria from 127 to 150.

https://www.britannica.com/biography/Ptolemy/Geographer
Ptolemy - Geographer, Astronomer, Mathematician: Ptolemy's fame as a geographer is hardly less than his fame as an astronomer. Geōgraphikē hyphēgēsis (Guide to Geography) provided all the information and techniques required to draw maps of the portion of the world known by Ptolemy's contemporaries. By his own admission, Ptolemy did not attempt to collect and sift all the geographical

https://www.famousmathematicians.net/ptolemy/
Ptolemy. One of the prominent Greek figures to contribute to mathematics was Claudius Ptolemy. Besides being a mathematician he was also a writer, poet, astronomer, astrologer and geographer. He wrote numerous scientific treatises which would later prove to be beneficial for Islamic, European and Byzantine scientists.

https://www.notablebiographies.com/Pe-Pu/Ptolemy-I.html
Ptolemy I (c. 366-283 B.C.E. ) was a Macedonian general under Alexander the Great (356-323 B.C.E. ) and founder of the Ptolemaic dynasty of Egypt, a family of fifteen kings—all of whom were named Ptolemy—who reigned over Egypt for more than three hundred years. Early life Born in the upper Macedonian region of Eordaia to the Macedonian

https://www.britannica.com/topic/Almagest
Almagest, astronomical manual written about 150 CE by Ptolemy. It served as the basic guide for Islamic and European astronomers until about the beginning of the 17th century. It is divided into 13 books and covers trigonometry; the motions of the Sun, Moon, and planets; and the positions of the fixed stars.