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Originally Posted by A Thousand Pardons
The arguments were against geocentrism, not Geocentrism, that he was talking about.
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Ok, so would somebody define "geocentrism" with a small "g"? If it is only meant to say "I pick a point and call it 'center'" (or "Bob" or "gesundheit") then there is no argument. That isn't a useful statement, however.
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Originally Posted by Astronomy
GR considers the whole discussion as to what reference frame to use absurd.
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This is because GR is simpler: it states simply that there is no preferred frame.
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Of course. And this is the crux of the argument. My understanding of the term "Geocentrism" is:
- Center has a specific meaning in geometry.
- It is a unique property of a structure. There can only be one center. It is a "preferred frame."
- The universe is a structure where it is possible to have a center in accessible space-time.
- The earth is the center of the universe. That is, everything else in the universe surrounds and rotates about the Earth, and only the Earth.
And that does not agree with either theory or observation.