Re: If the Earth weren't moving during the Venus transit
From: Brian Tung (brian_at_isi.edu)
Date: 06/10/04
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Date: Thu, 10 Jun 2004 20:51:18 +0000 (UTC)
Cousin Ricky wrote:
> I don't think so. The Earth is spinning, which is a form of
> acceleration. This means that the Earth's reference frame is not
> inertial, and cannot be considered "fixed" under relativity.
It certainly can. The tensor field has to be adjusted to account
for this, but it can be done. Close to the Earth, it's something
like diag(1+wr*cos(phi), 1-wr*cos(phi), ...); can someone who knows
what they're doing work it out for real?
> 2. Spin around 360 degrees. That should take about 2 seconds. Does
> that mean that, relative to you, the Sun has moved up to 940,000,000
> km in two seconds? That's more than 3000 times the speed of light!
> Although the Earth spins much more slowly than that, i think the
> concept can be generalized.
I forget how this is resolved in GR, but it is resolved.
Brian Tung <brian@isi.edu>
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