For further clarification please visit http://www.physclips.unsw.edu.au/jw/foucault_pendulum.html
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Where in that link does it prove that the movement is caused by the rotation of the earth rather than the overhead rotation of the stars?
3 paragraphs down. Under the heading "Does The Earth Move For You Too?"
The observation of Hipparchus and Ptolemy that one cannot feel the rotation of the earth is correct. However, the rate of rotation required for the heliocentric picture (0.0007 revolutions per minute) is so slow that one would not expect to feel it. How can one measure such a slow rotation? In 1851, Jean-Bernard-Leon Foucault suspended a 67 metre, 28 kilogram pendulum from the dome of the Pantheon in Paris. The plane of its motion, with respect to the earth, rotated slowly clockwise. This motion is most easily explained if the earth turns.
1st paragraph under "Why Does The Orbit Of Foucault's Pendulum Precess?"
Suppose* someone put a pendulum above the South Pole and sets it swinging in a simple arc. To someone directly above the Pole and not turning with the earth, the pendulum would seem to trace repeatedly an arc in the same plane while the earth rotated slowly clockwise below it. To someone on the earth, however, the earth seems to be stationary, and the plane of the pendulum's motion would seem to move slowly anticlockwise, viewed from above. We say that the pendulum's motion precesses. The earth turns on its axis every 23.93 hours, so to the terrestrial observer at the pole, the plane of the pendulum seems to precess through 360 degrees in that time.
For any more...read the f*****g page!