He did distribute several telescopes, but these were sent to princes and cardinals, not astronomers or mathematicians. “The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit”. “The orbit of every planet is an ellipse with the Sun at one of the two foci”. The apparent motion of the planet Mars in August and September 2003. If we assume that Eratosthenes used the Egyptian stadium of about 157.5 metres, however, then the circumference would have converted to 39,690 km, which is very close to the 40,030 km value accepted today.
We should say straight away that, although the work is now almost always known as the Almagest that was not its original name. Its original Greek title translates as The Mathematical Compilation but this title was soon replaced by another Greek title which means The Greatest Compilation. This … Read MoreRead More »