one full rotation of the earth is 26. 24 days long.
how long is one full rotation of the earth?
26. 24 days
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for any two points in the pendulum swing that are equidistant from the center of the swing there are two related points projected onto the surface of the earth. these points can be used to determine the corresponding surface velocity components that are in opposition and not acting in the same plane of the swing. the magnitude of the difference between these two points (for a given latitude of the center-point) is a relative measure of the time to observe one full rotation. the ratio of the velocity vector difference to the corresponding points at the north pole with the same equidistance from the center of the swing and the same projection to the surface can then be determined. the inverse ratio will determine the time observed for one full rotation of the pendulum swing in comparison to the duration at the pole of one day.
foucault pendulum vector diagrams