True, Pete. Don't know what you're getting at, but there are several other relativistic effects that are known to alter the precesssion of the gyroscopes which must be subtracted from the data.

1.There is a correction to the geodetic precession due to earth's oblateness....which amounts to about 7 milliarc sec/yr.

2. There is a SOLAR geodetic precession sometimes called the DeSitter-Fokker effect which is identical to the terrestrial geodetic effect, but is due to the mass of the sun.....and which amounts to....(let me check....you don't think I remember all these figures do you? ).....OK, about 19 milliarc sec/yr.

3. And there is starlight deflection from the guide star (due to the solar gravitational field) which varies through the year due to guidestar's changing position with respect to the sun as viewed from earth. I'm not sure of its value but probably varies between 0 and 15 or 20 milliarc sec. or so during the year.

None of these can be 'shielded' against....and they are simply calculated and subtracted from the data stream.

These above are the only three relativistic effects (besides the ones GP-B is designed to measure - earth's geodetic and frame dragging) that I know about which have been accounted for .

The other effect which I know has not been included is the spin-spin gravitomagnetic interaction between the gyroscopes that I have been pointing out in my previous post.

G^2

BTW,
(There are other completely distinguishable non-relativistic signals superimposed on the above,.... some variable...like aberration of starlight, etc. that also must be accounted for;.. but I only wanted to mention the relativistic ones).

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--"What's another name for thessaurus?" --