Thank you for updating our knowledge!! Very much appreciated!

Thomas

"PM 2Ring" <nomail@nomail> schreef in bericht
news:web.42dcd3f4100c4809d46eca60@news.povray.org...
>
> Don't forget about the Tychonic system - Tycho Brahe's odd compromise,
with
> the Sun & Moon orbiting Earth, and all the other planets orbiting the Sun.
>
> I should know, but memory is a funny thing... Contrary to my post of last
> week, Kepler didn't actually help to gather the Mars data, but Tycho hired
> him (after leaving Uraniborg) to analyze this data for him, about a year
> before Tycho's death.
>
> By his mid-twenties Kepler was a champion of the Copernican system: "In
> 1596, while a mathematics teacher in Graz, he wrote the first outspoken
> defense of the Copernican system, the Mysterium Cosmographicum." (See link
> below)
>
> I don't know what Kepler thought of the Ptolemaic system during his
student
> days (if I did know, I've forgotten :) but most of its various defects
were
> well-known by then. Not only was it not so accurate with position
> prediction, it had no explanation for the variable brightness of Mars, for
> example.
>
> For a quick bio and other interesting info, see
> http://kepler.nasa.gov/johannes/
>
> Halfway down this page is a very cute little .GIF anim of Kepler's Law of
> Areas.
>

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