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Physics 21 Online
OpenStudy (anonymous):

Which of these models of the solar system first proved that the sun is at one of the foci of Earth's elliptical orbit? Brahe model Kepler model Ptolemic model Copernicus model @PixieDust1

OpenStudy (pixiedust1):

hmmm... I'm actually not sure. I'd suggest doing some research on that one. I'm sure the answer is out there somewhere. if not, check your notes :)

OpenStudy (anonymous):

Okay I'm going to do just that :)

OpenStudy (pixiedust1):

Alrighty then :)

OpenStudy (anonymous):

I'm going with Keplers Model, i looked at the models and did some research and that one keeps coming up .

OpenStudy (anonymous):

Brahe did not have a model, just data Ptolemy thought the world went around the earth. Kepler was a good choice.

OpenStudy (anonymous):

Ty :)

OpenStudy (pixiedust1):

Out of all of those, I have only heard of Kepler, so i guess I would have to agree.

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