Foucault pendulum · plane precession
A free pendulum keeps swinging in a fixed plane while the Earth rotates underneath it. The apparent rotation rate depends only on latitude λ: a full turn per sidereal day at the pole, none at the equator. Tracing the bob over a compressed day draws a rose whose petal count is set by ω_F.
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Precession at this latitude: 11.18°/h — a full turn in 32.2 h.
