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Foucault pendulum on a rotating Earth

What you are seeing: a pendulum's bob traces a rosette on the local floor while its plane of oscillation rotates at Ω⊕sin⁡ϕ\Omega_\oplus \sin\phi. The globe shows the suspension point at the chosen latitude as Earth turns. At the pole the rosette closes in one sidereal day; at the equator the bob just swings back and forth on a single line

Figure 1. Foucault pendulum trace on the local floor + rotating Earth with suspension point at latitude phi. Method: Boris-style symplectic step in the co-rotating frame; Coriolis term as exact 2D rotation.
latitude (deg)49
amplitude1.00
animation speed2

WHAT TO TRY

  • Vary each control and watch the rail readouts respond.
  • Compare the diagnostic plot against the live scene.