Re: A rotating Earth?

[Joseph Bellina <jbellina@SAINTMARYS.EDU>]

I think a more careful statement would be that Kepler showed that a
model based on circular motion could not work, neither the Copernican
nor the Tychonian.  As I recall it was a matter of a few data points
missing by twice Tycho precision.  Something to tell students about when
they wonder why precision is important.


On Thu, 3 Feb 2000, Rick Strickert
wrote:

> Tycho Brahe's model was geostatic, combining parts of the geocentric and the
> heliocentric models.    Brahe pictured  the Sun and the moon (and presumably
> the stars) orbiting around the earth, but the planets rotated around the
> sun.
>
> Kepler, using Brahe's own data on Mars, showed that the geostatic model was
> not correct.
>
> Rick Strickert
> Radian International
> Austin, TX