ptolemy
The constellation of Andromeda was established by Ptolemy. It was one of the original 48 constellations listed in his second century treatise Almagest.
The Sumerians and Egyptians certainly had star maps and catalogs, but these have been lost. The oldest star atlas that we have record of was compiled by the Greek-Egyptian astronomer Claudius Ptolemy about 2000 years ago, and his atlas survived only because it was translated into Arabic 1500 years ago, and was discovered in the libraries of Cordova and Toledo, Spain, when "El Cid" conquered the Arabs and unified Spain.
The names of a majority of the visible stars are in, or derived from, Arabic. This is because the records from the Greek and Egyptian astronomers who originally cataloged all of the stars were lost in Europe after the fall of Rome. Those books, such as the Almagest, were only preserved in Egypt, and copies were captured by the Spanish from Arabic libraries in Spain and re-introduced into Europe at the beginning of the Renaissance.
He created the idea that the eart is round and was in motion. He also knew the planets rotated around the sun. Most of his theories were incorrct but were still taught because he was well respected.
Medieval people took their views on astronomy mostly from two great books, the Almagest and the Tetrabiblos, both by Claudius Ptolemaeus, or Ptolemy. He said there were two parts of astronomy, the easy and accurate part, and the hard part. The easy and accurate part was about predicting dates of the equinoxes, positions of the planets, phases of the moon, and so on, by mathematical calculations. The hard part was what we would call astrology, which was used to predict things about people's lives.
In 150 AD, Ptolemy published The Almagest This book was basically a summary of all the astronomical knowledge the Greek civilization had accumulated through the years. It included a listing of over 1000 stars and named 48 constellations. Those 48 constellations formed the foundation for our present constellation system.
Ptolemy
In the 2nd century he created a book called the Almagest which contained mathematical and astronomical discussion of the facts and principles of the motions of stars and planets. The book was accepted for over 1200 years, as it was very useful for calculating a celestial object's location in time.
Almagest is an astronomical manual written in 150AD by ptolemy, the date it was published is unknown. it served as a guide to astronomers in the early 17th century. The almagest is divided into 13 books. Each book is an argument on a different topic in the solar system. The Almagest also contained tables containing the exact position of planets at any given time. It was one of the first manuals written studying astronomy.
Claudius Ptolemy, who lived in Alexandria, Egypt, from about AD 90-168, published the earliest known systematic astronomical text which described a geocentric system of celestial mechanics, called the Almagest. Ptolemy was probably familiar with the work of Aristotle entitled On the Heavens, from almost 300 years earlier, which was geocentric in the abstract but lacked a systematic approach to observational astronomy.Hipparchus of Rhodes, a contemporary of Aristotle, described a system for recording astronomical observations.Millennia earlier, Babylonian and Sumerian astronomers of the early Babylonian period (about 2000 years BC) described the motions of the planets and arithmetical rules for planetary observation.
Claudius Ptolemy was the ancient Greek astronomer who described a geocentric universe in his book "Almagest." He believed that the Earth was at the center of the universe, with the planets and stars orbiting around it.
Yes, Ptolemy could be considered a successful astronomer. No history of astronomy would be complete without citing his early work. Though he lacked anything that we would consider as an astronomer's tool, he had a marvelous mind with which to consider the heavens. He took observations and wrote the Almagest(The Great Book), which is a monumental work in earliest astronomy. Use the links below to learn more.
Ptolemy
The Almagest, a treatise on astronomy was written in the second century A. D. Its author, Claudius Ptolemy, lived in Egypt and wrote in Greek.
An almagest is a comprehensive treatise on astronomy, alchemy, geography and/or mathematics, originally referring to the one compiled by Ptolemy around 150 CE.
Books that are part of human history such as the Bible or the Almagest.
Claudius Ptolemaes was born in AD 90 and died AD 168. He was born in Egypt and made himself king even though he wasn't a dynasty. he worked as an Egyptian astronomer. his biggest obstacle was showing the formulas he used to calculate the information he wrote in his book the Almagest.