![]() However, Foucault observed that his pendulum did seem to change direction. A pendulum set in motion, will not change its motion, so it will not change the direction of the swinging. A ball swinging back and forth on a string is called a pendulum. He pulled the sphere to one side and then released it, letting it swing back and forth in a straight line. In 1851, a French scientist named Léon Foucault took an iron sphere and swung it from a wire. Describe Earth's revolution around the Sun.Įarth's Rotation Figure 24.9: A pendulum at the North Pole always swings in the same direction, but because of Earth's rotation its direction will appear to change to observers on Earth.At the same time that the Earth spins on its axis, it also orbits, or revolves around the Sun. ![]() This spinning movement is called Earth's rotation. Earth spins around its axis, just as a top spins around its spindle. ![]() Imagine a line passing through the center of Earth that goes through both the North Pole and the South Pole.
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