In 331 BC, Alexander the Great founded the city of Alexandria. This marks the beginning of the Graeco-Roman period in Egypt’s history. Alexandria became one of the most famous of the Hellenistic capitals. Hellenism is the term describing the Greek way of life. The people of Alexandria retained some of their Egyptian culture, but it became mixed with that of the Greeks, Romans, Macedonians, Persians, Syrians, Jewish, and Chaldeans. When the Roman Empire began its decline, Alexandria managed to maintain its prestige as a center for cultural activity. By the time Alexandria began its decline, the scientific revolution was over, and astrology was accepted and believed by almost everyone. It was at this time that Claudius Ptolemy surfaced.
Almost nothing is known about Claudius Ptolemy. It is known that he was not Greek and was not even a Ptolemy (that is, he was not related to the Ptolemaic rulers). He was an Egyptian astronomer, mathematician, and geographer who lived in the vicinity of Alexandria. Bits and pieces of information from his writings and from comments from his contemporaries are the only sources of information about Ptolemy’s life. He was born in Upper Egypt, and some say that he was the head librarian at the museum or library at Alexandria.
Ptolemy worked from the data of past astrologers to map over one thousand stars. He compiled a list of 48 constellations, and, for the most part, described the longitude and latitude lines of the earth. He was a believer that the earth was the center of the universe and worked to advance this theory. His effort in this area was in his thirteen volume work called the Almagest. Here, the Ptolemaic system is described, thus explaining why some planets seemed to move backwards for periods of time in their orbit around earth. He theorized that each planet also revolved in a smaller circle as well as a larger one. This was called the "epicycle." This theory would survive for 1400 years, until it was finally accepted that the earth was itself another planet in orbit around the sun.
Almost nothing is known about Claudius Ptolemy. It is known that he was not Greek and was not even a Ptolemy (that is, he was not related to the Ptolemaic rulers). He was an Egyptian astronomer, mathematician, and geographer who lived in the vicinity of Alexandria. Bits and pieces of information from his writings and from comments from his contemporaries are the only sources of information about Ptolemy’s life. He was born in Upper Egypt, and some say that he was the head librarian at the museum or library at Alexandria.
Ptolemy worked from the data of past astrologers to map over one thousand stars. He compiled a list of 48 constellations, and, for the most part, described the longitude and latitude lines of the earth. He was a believer that the earth was the center of the universe and worked to advance this theory. His effort in this area was in his thirteen volume work called the Almagest. Here, the Ptolemaic system is described, thus explaining why some planets seemed to move backwards for periods of time in their orbit around earth. He theorized that each planet also revolved in a smaller circle as well as a larger one. This was called the "epicycle." This theory would survive for 1400 years, until it was finally accepted that the earth was itself another planet in orbit around the sun.
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