Uploaded January 2026 | Updated September 2026, 3 weeks ago
The precession of a Foucault pendulum changes predictably with latitude. This video shows how its rotation period can be used to estimate location, why the precession approaches zero at the equator, and why its direction reverses between the northern and southern hemispheres—direct signatures of a rotating spherical Earth.
The precession of a Foucault pendulum changes predictably with latitude. This video shows how its rotation period can be used to estimate location, why the precession approaches zero at the equator, and why its direction reverses between the northern and southern hemispheres—direct signatures of a rotating spherical Earth.
