Eudoxus of cyzicus biography

Importance to Astronomy

Eudoxus was the first person to devise a model that could explain the retrograde motion of the planets in the sky. (Keep in mind that there was not a great deal of real accurate data regarding the positions of the planets at the time.) Eudoxus was a gifted mathematician and was able to show that using three concentric spheres, one could arrange the spheres in such a way that a planet attached to one of the spheres could be made to travel around the common center, making periodic retrograde motions.

Because the spheres are all concentric, this is often called the "homocentric" model of planetary motion.

So how well did the model work?

Eudoxus of Cyzicus was a Greek navigator who explored the Arabian Sea for Ptolemy VIII, king of the Hellenistic Ptolemaic dynasty in Egypt.

Eudoxus Of Cyzicus (born 2nd century bc) was a Greek navigator and explorer who made the first known attempt to circumnavigate Africa from western Europe.

Eudoxus of Cyzicus us an ancient Greek explorer and sea navigator that is remembered by historical writings as one of the first sailors who managed to make successful trips between Arabian and Indian ports, explore Arabian Sea under contract from Ptolemy VIII king, the Hellenistic Ptolemaic dynasty in Egypt, and for.

Eudoxus of Cyzicus was a Greek navigator who explored the Arabian Sea for Ptolemy VIII, king of the Hellenistic Ptolemaic dynasty in Egypt.

Eudoxus of Cyzicus was a Greek navigator who explored the Arabian Sea and the Indian Ocean under the service of Ptolemy VIII, king of the Hellenistic.

Not very well, unfortunately. It had two glaring errors: the shapes of the retrograde loops in this model were always the same and it does not account the increase in brightness of the planets during retrograde motion. The success of the model, and its subsequent adoption by Aristo