Re: Doppler Shift is a measure of the varying speed of light

kenseto wrote: 
"Paul B. Andersen" <paul.b.andersen@xxxxxxxxxxxxxxxx> wrote in message
news:df56l7$2i4$1@xxxxxxxxxxxxxxxxxxx


No assumptions are made.
The wavelength is simply: lambda = d*sin(a)
where d is the grating spacing.
So all we do is to measure the angle a, and we have the wavelength.



The spectroscope is calibrated as follows:
Lambda of incoming H-alpha=lambda of observer's H-alpha*(frequency of
incoming H-alpha/frequency of observer's H-alpha)
In this case the speed of incoming light is assumed to be c and the
wavelength of incoming H-alpha is variable.

It is equally valid to calibrate the spectroscope to measure the speed of
imcoming light as follows:
c'=c*(frequency of incoming H-alpha/frequency of observer's H-alpha)
In this case the speed of incoming H-alpha light is assume to be variable
and the wavelength of the incoming light is constant (the same wavelength as
that of the observer's H-alpha)

Ken Seto 

You obviously know what you are talking about, because
this is exactly how astronomers calibrate their spectroscopes.
You read it in a book about spectroscopes, didn't you?

Paul
.

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