What data did Kepler get from Tycho Brahe?

Tycho Brahe (1546-1601), from a rich Danish noble family, was fascinated by astronomy, but disappointed with the accuracy of tables of planetary motion at the time. He decided to dedicate his life and considerable resources to recording planetary positions ten times more accurately than the best previous work. read more

The most useful of Tycho Brahe's observations to Kepler were planetary positions accurately recorded over a period of time, based on which he derived the famous Kepler's laws of planetary motion. This page may be out of date. read more

However, that was before Tycho's results were used. Kepler realized that Tycho's work could settle the question one way or the other, so he went to work with Tycho in 1600. Tycho died the next year, Kepler stole the data, and worked with it for nine years. He reluctantly concluded that his geometric scheme was wrong. read more