Sure..
That's what all those geodesy folks do.  Over sufficient time span, one can 
relate gps measurements to an eci frame
On Dec 5, 2010, at 5:43 PM, "J. Forster" <[email protected]> wrote:

> GPS surveying "relative to astronomical reference"? I don't think so.
> 
> -John
> 
> ==============
> 
> 

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