[time-nuts] Water on Enceladus - What does this imply about NASA'a ability to measure frequency?

[Dr. David Kirkby]

On 4 Apr 2014 08:55, "Tom Knox" <actast at hotmail.com> wrote:
>
>  90 microns  is approx a freq res of about 1 x 3.66 -12
>
> Thomas Knox

Since the Doppler shift is prortional to the frequency,  I can't see how
one can determine the absolute frequency.

But given light travels at 3e8 m/s and they can resolve 9e-5 m/s, I would
have thought that the frequency resolution needed was  9e-5/3e8=3e-13. We
are differing by more than a factor of 10.

Dave