A visit to an asteroid with a pendulum helps explain. We spin with the asteroid, watching the stars go by, and discover that the pendulum seems to be rotating with the universe.
Look up the locations of the Earth's Foucault pendulums to find one nearby.
The pendulum is started in the traditional way, with flame.
Back at the home page we find that the pendulum has continued its rotation, dependent on our latitude, in synchrony with the universe.
Gradually it rotates enough to knock down another peg. Why?
The Coriolis page shows why the pendulum is moving the way it does: the pendulum's precession is due to the Coriolis Effect.
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It starts to swing, knocking down a peg on the perimeter and then the peg opposite.