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What (who) is FitzGerald contraction - definition
![Minkowski diagram of Einstein's 1911 [[thought experiment]] on length contraction. Two rods of rest length <math>A' B' = A'' B'' = L_0</math> are moving with 0.6c in opposite directions, resulting in <math>A^\ast B^\ast <L_0</math>.](https://commons.wikimedia.org/wiki/Special:FilePath/EinsteinContraction.svg?width=200 "Minkowski diagram of Einstein's 1911 [[thought experiment]] on length contraction. Two rods of rest length <math>A' B' = A'' B'' = L_0</math> are moving with 0.6c in opposite directions, resulting in <math>A^\ast B^\ast <L_0</math>.")
![Formula on a wall in Leiden, Netherlands. Lorentz was chair of theoretical physics at the [[University of Leiden]] 1877-1910](https://commons.wikimedia.org/wiki/Special:FilePath/Lorentz contractie - mural Leiden, 2017.jpg?width=200 "Formula on a wall in Leiden, Netherlands. Lorentz was chair of theoretical physics at the [[University of Leiden]] 1877-1910")
Wikipedia
Length contraction is the phenomenon that a moving object's length is measured to be shorter than its proper length, which is the length as measured in the object's own rest frame. It is also known as Lorentz contraction or Lorentz–FitzGerald contraction (after Hendrik Lorentz and George Francis FitzGerald) and is usually only noticeable at a substantial fraction of the speed of light. Length contraction is only in the direction in which the body is travelling. For standard objects, this effect is negligible at everyday speeds, and can be ignored for all regular purposes, only becoming significant as the object approaches the speed of light relative to the observer.
