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ɪ k /; Koinē Greek: Πτολεμαϊκὴ βασιλεία, Ptolemaïkḕ basileía) [6] or Ptolemaic Empire [7] was an Ancient Greek polity based in Egypt during the Hellenistic period. [8] It was founded in 305 BC by the Macedonian Greek general Ptolemy I Soter , a companion of Alexander the Great , and ruled by the Ptolemaic dynasty until ...
In astronomy, the geocentric model (also known as geocentrism, often exemplified specifically by the Ptolemaic system) is a superseded description of the Universe with Earth at the center. Under most geocentric models, the Sun , Moon , stars , and planets all orbit Earth.
Reigning for 275 years, the Ptolemaic was the longest and last dynasty of ancient Egypt from 305 BC until its incorporation into the Roman Republic in 30 BC. [ 6 ] [ 7 ] Ptolemy , a general and one of the somatophylakes (bodyguard companions) of Alexander the Great , was appointed satrap of Egypt after Alexander's death in 323 BC.
The potential Roman influence would have been great. In Ptolemaic Egypt, Roman adventurers and veterans are found commonly serving under the Ptolemies. Romans are found in Ptolemaic service as early as 252/1 BC. The Ptolemaic army was odd in that, out of all the Hellenistic armies, it was the only army where you could find Romans in Greek service.
Ptolemy's world map, reconstituted from Ptolemy's Geography (circa 150) in the 15th century, indicating "Sinae" at the extreme right, beyond the island of "Taprobane" (Ceylon or Sri Lanka, oversized) and the "Aurea Chersonesus" (Southeast Asian peninsula).
Counting the total number is difficult, but estimates are that he created a system just as complicated, or even more so. [16] Koestler, in his history of man's vision of the universe, equates the number of epicycles used by Copernicus at 48. [17] The popular total of about 80 circles for the Ptolemaic system seems to have appeared in 1898.
Ptolemaic is the adjective formed from the name Ptolemy, and may refer to: Pertaining to the Ptolemaic dynasty ... Ptolemaic system, ...
An edition in Latin of the Almagestum in 1515. The Almagest (/ ˈ æ l m ə dʒ ɛ s t / AL-mə-jest) is a 2nd-century mathematical and astronomical treatise on the apparent motions of the stars and planetary paths, written by Claudius Ptolemy (c. AD 100 – c. 170) in Koine Greek. [1]