Microwave anisotropies do not change over time.
On Tue, 8 Jun 1999, Eugene Leitl wrote:
> Spatial inhomogenities in the microwave background could be useful for
> ultra-deep-space navigation. Unfortunately, I have no idea how they
> change over long periods of time. Also, the observed Doppler shift (one
> hemisphere bluer, one redder) due to own movement gives one a global
> frame of reference for speed of travel.
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