Using the conclusion of simultaneous relative nature in the narrow relative nature, the author analyzes the relative nature and absolute nature of relative movement clock and then the author points out that the relative nature of simultaneous nature is common in its existence and effective.
The paper suggested that the simultaneity is the basis of time and space test,the concept of the simultaneity has close links with the concept of time and space,the relativity of the simultaneity is the certain result of the principle of light-speed non-change,clock-slowing effect is the direct reaction of the simultaneity's relativity,and size-contracting effect is the indirect reaction of the simultaneity's relativity.
This paper directly explains the relativity of simultaneity and derives the retar-dation and Lorentz contraction according to the principles of special relativity. The specialforenty transformation is obtained easily on the basis of the results.
The relativity of aimultaneity is a very important concept in Einstein′s special theory of relativity,The relativity of simultanety of formulated by Lorentz transformation and the physical significances of nonsynchronization of clocks in the different inertial systems are illustrated. Therelativity of the effect of slowness of clocks and contraction of length are also discussed.