[time-nuts] Water on Enceladus - What does this imply about NASA'a ability to measure frequency?
actast at hotmail.com
Fri Apr 4 15:59:05 UTC 2014
You are correct. I did most in my head late last night and kind of lost my focus as I was finishing. I was attempting to see roughly what timing accuracy was needed. I meant to end the sentence with a question mark.
> Date: Fri, 4 Apr 2014 13:01:12 +0100
> From: drkirkby at gmail.com
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Water on Enceladus - What does this imply about NASA'a ability to measure frequency?
> 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.
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