Arago vs Vogel

On 27/10/2011 17:30, Szczepan Bialek wrote:
napisal w wiadomosci
...
On 27/10/2011 09:07, Szczepan Bialek wrote:

So the: " "The first result of any importance which the spectrographic
method furnished was the proof of the influence of the Earth's annual
motion
on the displacement, which the earlier direct observations had failed
to
show." was probably verified by many others. Also with the radio waves.

S*

I'm sorry, but I still don't see what point you're making. You can't
detect any diurnal/annual change to the speed of light by the Earth's
motion,

The diurinal was detected by Michelson-Gale in 1925 and is prectised in GPS.

The diurnal what? Clearly not a diurnal change in the speed of light, so
what?

but you can detect a diurnal/annual effect by using spectroscopy.

The annual was detected by Vogel and I do not know who use it.

The two experiments are doing different things and the results are
completely compatible.

The Arago result of spectroscopy is compatible with Michelson-Morley and
Michelson-Gale.

I'm not sure the Arago result was spectroscopic in nature.

The Vogel's result do not fit to them.

Why not?