The mathematician Claudius Ptolemy was an Egyptian. Egypt was then under Roman-Greek rule. So many people know him as a Greek mathematician.
Apart from mathematics, Ptolemy was also a scholar in geography, astronomy and astrology.
In the famous book 'Almagest' in 145, he set up a model of the universe. The book was read for about one and a half thousand years. For many, his opinion was then established. As can be seen later, Ptolemy's model of the universe is just a model of the solar system.
Although the model is wrong in today's judgment, it has enough impression of mathematical craft.
Earth, Moon, Mercury, Venus, Sun, Mars, Jupiter, Saturn have been continuously placed in the model of the universe created by him. The earth is shown at the center of these.
The theorem on the quadrilateral inside the circle is Ptolemy's. He used the theorem to make trigonometric tables.
Although the model is wrong in today's judgment, it has enough impression of mathematical craft.
Earth, Moon, Mercury, Venus, Sun, Mars, Jupiter, Saturn have been continuously placed in the model of the universe created by him. The earth is shown at the center of these.
The theorem on the quadrilateral inside the circle is Ptolemy's. He used the theorem to make trigonometric tables.
Ptolemy was a true legend