Foucault Pendulum The animation describes the motion of a Foucault Pendulum at a latitude of The plane of oscillation rotates by an angle of during one day, so after two days the plane returns to its original orientation.
An excerpt from the illustrated supplement of the magazine "Le Petit Parisien" dated November on the fiftieth anniversary of the experiment of Leon Foucault demonstrating the rotation of the earth.
Foucault Pendulum, which proves the earth rotates, is located in the rotunda of the Charles C. Gates Planetarium in City Park. The original was built in Paris in 1851, using an Iron ball at the end of a 200-foot wire. Viewing action is Mrs. Dorothy Hodgkins of planetarium staff and Don Lunetta, curator. Credit: Denver Post
Watch as a “Foucault Pendulum” reveals the rotation of the Earth just as it did in 1851. The degree of rotation per sidereal day is proportional to the sine of the latitude. For example, if the experiment is carried out at the 30 degree south latitude, to a local observer it would take 2 days to rotate around the full 360 degree precession in a counterclockwise fashion. https://www.geophysik.uni-muenchen.de/outreach/foucault-pendulum #FlatEarth
How Does Foucault's Pendulum Prove the Earth Rotates?
How Does Foucault's Pendulum Prove the Earth Rotates? | At the Smithsonian | Smithsonian