= C. W. F. Everitt
{c}
<C. W. F. Everitt> led the <Gravity Probe B> experiment, which tested <general relativity> using four cryogenic <gyroscopes> in Earth orbit. The instrument measured slow changes in spin-axis direction relative to a stellar reference, separating the <geodetic effect> from <frame dragging>.
The 2011 final-results paper reported a geodetic drift of $-6601.8\pm18.3$ milliarcseconds per year and a <frame dragging> drift of $-37.2\pm7.2$ milliarcseconds per year, compatible with the predicted values within the reported uncertainties. The latter effect was much smaller, illustrating why identifying and modelling instrument drifts was central to the test.<Gravity Probe B: Final Results of a Space Experiment to Test General Relativity by C. W. F. Everitt and others>[Abstract: four-gyroscope results and comparison with relativity predictions]{ref}
\Image[https://einstein.stanford.edu/highlights/AustriaDecScArt.jpg]
{title=<C. W. F. Everitt> receiving an award in 2011}
{description=Everitt is on the left, as identified in the https://einstein.stanford.edu/highlights/status-news.html[Stanford Gravity Probe B mission account of the 4 May 2011 presentation].}
{height=300}
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