The Coriolis force, which drives the Foucault pendulum's precession, works clockwise in the northern and counterclockwise in the southern hemisphere. Therefore, at or near the equator, there is no or very little Coriolis force. Hence a Foucault pendulum cannot work there. The closest one to the equator seems to be at the Simon Bolivar Library at the University in Caracas, Venezuela; it takes 138 h to rotate. The furthest one from the equator is probably at the Consortium Library at the University of Alaska Anchorage; it takes 28 hours to rotate.