But, it was postulated, if ether exists, then another observable phenomenon, ether "drift," must also exist. If both the Earth and light are moving through the ether, then the velocity of light observed on the Earth would depend on the direction of observation. The ether was regarded as stationary; the Earth and other planets, the Sun and the stars, and light moved through it. By measuring the apparent velocity of light in various directions, one could determine the absolute velocity and direction of motion of the Earth.

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