Tycho's Data and Kepler's Model of The Solar System
Tycho Brahe had spent much of his life obtaining measurements of the position of stars and planets to a much greater accuracy than had been possible previously. He wished these observations to be the basis of a new and more accurate set of star tables. Kepler was able to prepare these new tables using Tycho's accurate observations together with a heliocentric model of the solar system and his own discovery of the elliptical orbits of the planets. Accurate calculation was aided by the newly published system of logarithms which simplified accurate calculation and made them less prone to errors.
Read more about this topic: Rudolphine Tables
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