WIKI Foucault gyroscope: The gyroscope was invented in 1852 by the French experimental physicist Leon Foucault (1819-1868) as part of a two-pronged investigation of the rotation of the earth. ... But, the principle is well-known to all children who move their toy gyroscopes about and observe that the spinning disk stays in the same orientation.
Oddly, no observable motion of the planet can be detected, even with modern high speed avionics gyros. https://savageplane.wordpress.com/2016/11/14/gyroscope/
WIKI Foucault gyroscope: The gyroscope was invented in 1852 by the French experimental physicist Leon Foucault (1819-1868) as part of a two-pronged investigation of the rotation of the earth. ... But, the principle is well-known to all children who move their toy gyroscopes about and observe that the spinning disk stays in the same orientation. Oddly, no observable motion of the planet can be detected, even with modern high speed avionics gyros. https://savageplane.wordpress.com/2016/11/14/gyroscope/