Re: Paradox: stars revolving earth in 24 hours
- From: Ben Rudiak-Gould <br276deleteme@xxxxxxxxx>
- Date: Tue, 24 Jul 2007 02:08:09 +0100
ongeluk@xxxxxxxxx wrote:
I was told that it has been calculated that one may indeed asume the
earth centered in the universe and all the stars revolving around her
in 24 hours. It does not violate relativity theory and even the
flattening of the earth can be explained in this view with the help of
apparant forces that account for it.
Anybody got a good reference to get more information about this
"relativity: issue?
Yes, you can do this, but there's no physical content to that statement. Any time you have some mathematical equations that mention a variable x, you can do a substitution of variables to replace x with something like y = sinh x. For the same reason, you can define coordinates (x,y,z,t) for the whole universe such that the x, y, and z of places on Earth don't change with t. But that doesn't tell us anything about the universe. Some coordinate systems are better than others in that the laws of physics have a simpler form with respect to those coordinates. There's nothing wrong with a geocentric model of the solar system, but a heliocentric model is simpler, and that /does/ tell us something about the universe. It's in that sense (and only that sense) that the earth is really moving.
-- Ben
.
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