Gravity Probe B (GP-B) was a satellite-based experiment ... - dofaq.co
gravity probe b

Gravity Probe B (GP-B) was a satellite-based experiment ...

wikipedia - 14 Aug 2022
Gravity Probe B (GP-B) was a satellite-based experiment to test two unverified predictions of general relativity: the geodetic effect and frame-dragging. This was to be accomplished by measuring, very precisely, tiny changes in the direction of spin of four gyroscopes contained in an Earth-orbiting satellite at 650 km (400 mi) altitude, crossing directly over the poles.

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