102,815
edits
Changes
→Heliocentrism
===Heliocentrism===
===Heliocentrism===
Kepler tried, but was unable, to persuade Tycho to adopt the [[heliocentrism|heliocentric model]] of the [[solar system]]. Tycho believed in a modified [[geocentric model]] known as the [[Tychonic system]], for the same reasons that he argued that the supernova of 1572 was not near the Earth. He argued that if the Earth were in motion, then [[List of nearest stars|nearby stars]] should appear to shift their positions with respect to background stars. In fact, this effect of [[Parallax#Stellar parallax|parallax]] does exist; but it could not be observed with the naked eye, or even with the telescopes of the next two hundred years, because even the nearest stars are much more distant than most astronomers of the time believed possible. The Tychonic system is very similar to the Copernican one, except that it has a static earth instead of a static sun.
Kepler tried, but was unable, to persuade Tycho to adopt the [[heliocentrism|heliocentric model]] of the [[solar system]]. Tycho believed in a modified [[geocentric model]] known as the [[Tychonic system]], for the same reasons that he argued that the supernova of 1572 was not near the Earth. He argued that if the Earth were in motion, then [[List of nearest stars|nearby stars]] should appear to shift their positions with respect to background stars. In fact, this effect of [[Parallax#Stellar parallax|parallax]] does exist; but it could not be observed with the naked eye, or even with the telescopes of the next two hundred years, because even the nearest stars are much more distant than most astronomers of the time believed possible. The Tychonic system is very similar to the Copernican one, except that it has a static earth instead of a static sun.