How We Know The Earth Moves

Format: 16mm

Sound: sound

Copyright: Registered 16May78 · PA 11-048 (Jul-Dec 1978) Copyright holder: CBS, Inc Production company: Distributed by BFA

Description: Explains and demonstrates the Foucault pendulum by which the earth's rotation was first proved. An experiment illustrates star shift, the method astronomers use to determine the earth's solar orbit.

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