At the poles of the Earth, the period of full revolution of the plane of oscillations of the Foucault pendulum is one sidereal day (23h6m mean solar time). At latitude φ, the angular velocity of rotation of the oscillation plane w = 15 ° sin φ per sidereal hour For example, for Ryazan (φ = 54 ° 38) the rotation period will be equal to 29h21m. At the Earth’s equator, the plane of oscillation of the Foucault pendulum will not change its position and therefore the sought period will be equal to infinity.
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