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Absolute rotation
In physics, the consideration of absolute rotation—rotation independent of any external reference—is a topic of debate about relativity, cosmology, and the nature of physical laws. The question of whether absolute rotation is meaningful is independent of the issue of the existence of absolute time and space.
==Is it meaningful to talk about absolute rotation?==
For the concept of absolute rotation to be scientifically meaningful, it must be measurable. In other words, can an observer distinguish between the rotation of an observed object and their own rotation? Newton suggested two experiments to resolve this problem. One is the effects of centrifugal force upon the shape of the surface of water rotating in a bucket. The second is the effect of centrifugal force upon the tension in a string joining two spheres rotating about their center of mass. A related third suggestion was that rotation of a sphere (such as a planet) could be detected from its shape (or "figure"), which is formed as a balance between containment by gravitational attraction and dispersal by centrifugal force.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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