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Observer (physics) : ウィキペディア英語版
Observer (physics)

The term observer has a number of non-equivalent uses in science.
==Special relativity==
(詳細はspecial relativity refers most commonly to an inertial reference frame.
In such cases an inertial reference frame may be called an "inertial observer" to avoid ambiguity. Note that these uses differ significantly from the ordinary English meaning of "observer". Reference frames are inherently nonlocal constructs, covering all of space and time or a nontrivial part of it; thus it does not make sense to speak of an observer (in the special relativistic sense) having a location. Also, an inertial observer cannot accelerate at a later time, nor can an accelerating observer stop accelerating.

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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