I was just about the post the same :)
So how large would they predict the deviation to be after two years?
Monique; there are two GR effects predicted upon the gyroscopes.
One is a geodetic effect (due to the 'curvature' of space-time) which amounts to an anomolous precession of about 6.6arcseconds per year.
The other is the Lense-Thirring (frame dragging) precessional prediction which comes to only 0.042 arcseconds/yr.
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