Re: Our greatest problem!

In sci.physics.relativity, kenseto
<kenseto@xxxxxxxxxx>
wrote
on 11 Apr 2007 07:45:05 -0700
<1176302705.135090.278630@xxxxxxxxxxxxxxxxxxxxxxxxxxx>:
On Apr 11, 12:07 am, The Ghost In The Machine
<e...@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
In sci.physics.relativity, kenseto
<kens...@xxxxxxxxxx>
wrote
on 10 Apr 2007 11:05:03 -0700
<1176228303.397182.278...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:





On Apr 10, 12:16 pm, The Ghost In The Machine
<e...@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

[snip for brevity]

Indeed. SR predicts a change in wavelength (as measured by e.g. a
diffracting rating). Galilean relativity and AFAICT IRT do not.

The grating is used by all observers to define the wavelength of any
light source in the observer's frame. Any incoming light becomes a new
light source in the observer's frame and the wavelength for that new
light source is defined by the grating. The wavelength of the original
source is not changed during transit.

Of course it's not. That's why gratings are routinely used to estimate
Earth-relative velocity in astronomy.

Of course yes. In IRT the wavelength of a specific light source such
as the sodium is a universal constant. Any change in measured
frequency of incoming light is due to the varying speed of the
incoming light.

Gratings don't measure frequency.

[rest snipped]

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