Note that while the Pendulum seems to change its path during the day -- actually it is the floor beneath it that changes, being twisted around by the daily rotation of earth.

Click the times below to see how the direction of the pendulum's line of swing changes in relation to the floor.

At San Francisco latitude, the floor turns about 220º under the pendulum in about 24 hours (at North Pole, it would turn a full circle 360º)

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